Lice vs

Lice vs. Fleas

What are lice?

Lice are tiny parasites that can infest the human skin and scalp. They are wingless insects that are about the size of a sesame seed. Infestation with lice is known as pediculosis and can occur on the head (head lice), body, or genital area (pubic lice). Different types of lice tend to infest the scalp, body, or genitals.

What are fleas?

Fleas, like lice, are small wingless insects. Unlike lice, which can only crawl, fleas can jump from one host (such as a pet) to another. Fleas mainly feed on non-human hosts but are able to infest humans. Lice can only live for a day or two without a host, but fleas may live for up to 100 days without a human or animal host. Fleas can live in fabrics and carpets in the home and may be carried by pets.

What are the signs and symptoms of lice and fleas?

Head lice symptoms

Head lice cause an intense itching or tickling feeling in the hair. It is usually worse at night when the lice are most active. The lice themselves may be visible, or you may recognize the nits (eggs) attached to hair shafts. On the body, lice also cause severe itching and may cause a red rash as an allergic reaction. If the lice have been present for some time, the skin may thicken or become dark. Pubic lice cause a similar reaction in the genital areas.

Fleabite symptoms

Fleabites may not produce a visible reaction in many people, so no symptoms may be apparent. In others, fleabites may appear as small bites with a central red spot on the skin. They may appear in groups or form a scab. Uncommonly, people may develop an allergic reaction to fleabites that includes skin swelling, irritation, and hives.

When to seek medical care for lice and fleas

Seek medical advice if you have symptoms suggestive of lice or fleabites and if home remedies or over-the-counter medications are ineffective.

What specialists treat lice and fleas?

Health care professionals who practice primary care — including family practitioners, internists, and pediatricians — typically treat lice and fleas. Sometimes dermatologists or skin specialists treat these conditions.

How do doctors diagnose lice and fleas?

Doctors diagnose a lice infestation by observing the skin directly and identifying the lice or their eggs. They diagnose fleabites typically by looking at the affected skin. Fleabites may sometimes be confused with bedbug bites, but bedbug bites may form blisters, while fleabites typically do not. No special tests are usually required for the diagnosis of lice or fleas.

What are treatments and home remedies for lice and fleas?

Body and head lice treatment

Body lice are usually managed by washing the body well along with any personal belongings that could be contaminated. There are a number of over-the-counter products available that kill head lice and pubic lice. Prescription medications are available if over-the-counter products are not effective.

Home remedies for fleas

Home remedies that may manage fleabites include over-the-counter cortisone creams, tea tree oil, calamine lotion, and vinegar. Antihistamine medications may be necessary for allergic reactions to fleabites.

What is the prognosis for lice and fleas?

Scratching or irritation of the affected areas can sometimes lead to complications like skin and soft tissue infections. However, lice infestations and fleabites are treatable and typically do not cause any long-term problems.

How to prevent lice and fleas

If someone has been infested with lice, it is important to de-contaminate personal belongings.

  • Wash bedding, towels, and clothing with hot, soapy water with a temperature of at least 130 F (54 C), and dry them on high heat for at least 20 minutes.
  • Dry cleaning is also effective.
  • Seal non-washable materials in a plastic bag and store them in a warm area for two weeks.
  • Lice-killing sprays and other products are available for mattresses and furniture.

Prevent fleas by:

  • Properly treating family pets with veterinarian-recommended anti-flea medications
  • Regularly cleaning and vacuuming furniture and floors
  • Regularly washing bedding and home textiles


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Bedbugs (Bed Bugs) vs. Lice

Bedbugs are small blood-sucking parasites that feed on mammals and birds. Some people do not have any symptoms of bedbug bites while others have them they include pain and reddish-colored skin lesions where the bite is. Bedbugs are found in temperate and tropical climates worldwide. Bedbugs usually feed every five to 10 days. Bedbug bites usually do not need treatment. Bedbug infestations are difficult to get rid of. Bedbugs are a problem worldwide, are resurging.

There are three types of lice, head, body, and pubic. Head lice is a grey-white animal about the size of a sesame seed and can be mistaken for dandruff. Head lice are transmitted from the body to other household items. They produce between seven to 10 eggs (nits) annually. Head lice is transferred from head-to-head contact. Body lice are slightly bigger than head lice and look like head lice. Body lice is transferred from human to other household items. Pubic lice or «crabs» is distinctly different from the head and body louse. Pubic lice in adults is transferred by direct sexual contact. Children and others get pubic lice via nonsexual transmission from their parents, relatives, and friends who share clothing. Lice bites are bluish in color sore that develop on different areas of the body. Condoms do not prevent from getting pubic lice. The different types of lice have different treatment. Lice can be eradicated from your home.

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Crabs (Pubic Lice) Picture

Flea Bites (In Humans)

Flea bites are caused by the parasitic insect, the flea. The most common species of flea in the US is the cat flea, Ctenocephalides felis. Signs and symptoms of flea bites in humans include itching, hives, a rash with bumps, red spots with a «halo,» and swelling around the bite. Treatment for flea bites includes over-the-counter medicine and natural and home remedies to relieve and soothe itching and inflammation. The redness of a flea bite can last from a few hours to a several days.

The use of the head louse as a remedy for jaundice in Spanish folk medicine: an overview



In Spain, head lice are considered a therapeutic resource for the treatment of jaundice. All folk remedies based on the ingestion of these insects meet in the present document, previously dispersed among a large number of references.


An overview of the Spanish literature has been carried out. The most important databases have been consulted. All related works have been examined.


Although the method of preparation is diverse and the dose varies, the primary recommendation is a transference ritual consisting of taking nine live lice for nine days on an empty stomach without the patient’s knowledge. This traditional knowledge survives in Spanish society, and constitutes an example of the interrelation between Spanish and Latin American folk medicines.

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The survival of this therapy in the worldview of certain rural communities suggests the need to take into account the beliefs, ideas and behaviour patterns of popular culture in relation to health and disease.

Resumen (in Spanish)


En España, los piojos de la cabeza son considerados un recurso terapéutico para el tratamiento de la ictericia. Todos los remedios populares basados en la ingestión de estos insectos se reúnen en el presente documento, previamente dispersos por un gran número de referencias.


Se ha llevado a cabo una revisión exhaustiva de la literatura española y han sido consultadas las bases de datos más importantes. Se han examinado todos los trabajos relacionados.


Aunque el método de preparación es diverso y la dosis varía, la recomendación principal es un ritual de transferencia consistente en tomar nueve piojos vivos durante nueve días en ayunas y sin el conocimiento del paciente. Este conocimiento tradicional sobrevive en la sociedad española, y constituye un ejemplo de la interrelación entre las medicinas populares española y latinoamericana.


La supervivencia de esta terapia en la cosmovisión de algunas comunidades rurales sugiere la necesidad de tener en cuenta las creencias, ideas y patrones de comportamiento de la cultura popular en relación con la salud y la enfermedad.


Entomotherapy, understood as the use of insects or products derived from them for the treatment of human diseases [1], is currently one of the main focuses of ethnozoological research. Many authors have reported inventories of useful taxa, for example in Brazil more than 80 insect species are described [2], but they also document the importance of these animals in folk medicine, especially in rural areas. This is why research projects have been implemented in certain ethnic groups, human communities or cultures in which the use of medicinal insects and traditional knowledge about such species remain in force despite the risk of their attrition and risk of eventual disappearance [3, 4].

Jaundice is not a disease but an external sign of an underlying pathological process that interferes with the normal functioning of the metabolism and excretion of bilirubin [5–7]. However, since antiquity it has been described as such–see Blánquez 1966 [8]–and folk medicine has treated jaundice using a wide variety of remedies from time immemorial. In Spain, according to George M. Foster [9], there are three main methods of healing jaundice: urinating on certain plant species, watching the water running on the bank of a river or stream, and drinking water containing human lice (Pediculus humanus Linnaeus, 1758). Among organisms of this taxon of blood-sucking insects (Phthiraptera: Anoplura: Pediculidae), two subspecies are differentiated: P. humanus humanus Linnaeus, 1758 (the body louse) and P. humanus capitis De Geer, 1778 (the head louse) [10, 11]. Populations of these two lice can be separated based on a few morphological features, but mostly on the basis of certain behavioural and ecological differences. Head lice live and feed exclusively on the scalp, whereas body lice live on clothing and only move to the skin to feed [10, 12, 13]. This ecological differentiation arose when humans adopted frequent use of clothing [14]. In addition, molecular studies [15, 16] confirm that head and body lice are conspecific, despite their differences. This point raises the first question: what subspecies is used as a medical remedy for jaundice? In 1929 Gárate [17] wrote: “… D. Miguel de Unamuno told me that several Pediculi capitis were poured into a glass, were crushed and water was added…” Subsequently, in 1972, Donostia clarifies that “live lice, taken from a clean and disease free head” are used [18]. These two direct references are sufficient to exclusively consider the use of head lice for the treatment of jaundice.

The life cycle of the head louse has three stages: egg, nymph, and adult. Adults are small (2.1–3.3 mm long), dorso-ventrally flattened and entirely wingless. Females can lay about 7 eggs per day, gluing nits to the base of human hair. To survive, adult lice need to feed on blood several times daily [10, 12, 13].

The objective of this paper is to collect in one document all traditional remedies used against jaundice based on the intake of adult head lice within the realm of Spanish folk medicine. These remedies, just as for other animal species, are scattered among countless references (many of which are inaccessible to the general public). It also analyzes the validity and geographical distribution of this therapeutic resource in Spain, and its relationship with the traditional medicine of other cultures.


To get the maximum number of documentary sources, a qualitative systematic review of international and national databases was carried out. The international databases ISI Web of Science and Anthropology Plus were consulted. Domestic resources that were referenced include the database of Doctoral Theses TESEO, databases of the information system of Consejo Superior de Investigaciones Científicas (CSIC) and bibliographic web Dialnet. The overall search pattern covered the title, abstract and key words concerning ethnozoology related disciplines that have UNESCO codes (e.g., anthropology, history of medicine, zoology, entomology) and terms louse (lice), jaundice, folk medicine, folklore, digestology, ethnozoology, zootherapy and entomotherapy, in conjunction with the Spanish geographical scope. In turn, all related works systematically obtained were checked for recording data on the use of head lice as a remedy for jaundice.


A total of 33 studies were reviewed from the literature search. Table 1 provides a list of references consulted (arranged chronologically). The original descriptions of the remedies are included, and the geographical location of the use is indicated.


The therapeutic use of head lice against jaundice has remained in Spanish oral tradition and has survived until today, although its current use has not been documented in research within the last decade.

Method of preparation and dosage

In 9 studies (27%) the necessary intake of live lice is documented. It is a transference therapy based on the belief that these insects feed on bile, which is the materialization of the “disease” [18, 25, 50].

Many references indicate that lice should be administered to the patient on an empty stomach without his/her knowledge. They are usually dissolved or mixed in food that the patient has to take. A wide range of food is mentioned and chocolate is especially recommended.

With regard to the dosage, 16 studies (48%) indicate the number of lice to ingest. In most cases, odd numbers are mentioned; in nine the recommended number is 9. This is the same amount that appears most often as the recommended number of days for treatment duration (9 days). In Spanish popular culture, the odd are laden with symbolism and considered to be sacred in character, thus, they form part of healing rituals. The number 9 is considered as “the perfection” and a symbol of life [51].

Geographical distribution

As for the geographical distribution of the use of head lice as a remedy for jaundice, appointments found cover much of the northwestern quadrant of Spanish territory (Figure 1). Numerous localities in the Basque Country and Navarre are mentioned.

Geographical distribution of the use of head lice as an anti-jaundice remedy in Spain. The cited provinces and autonomous communities are highlighted in gray; ( ) mentioned localities; ( ) “comarcas” (

Numerous authors show that using animal resources as therapy is a widely distributed atavistic practice [52, 53], a fact that is demonstrated by the use of head louse against jaundice in distant geographical areas [54, 55]. Its use is particularly common in the Hebrew culture. Izaak Walton in his famous book “The Compleat Angler” (published in 1653) records that the Jews were the first to say that swallowing live lice is a good remedy for jaundice [56]. For their part, the German rabbi Yair Bacharach (1639–1702), author of the collection of responsa known as “Havvot Yair” (“Villages of Yair”), indicates that the patient should take 8 lice taken from his/her own head–see Rosner and Bleich 2000 [57]. Ben-Ezra in 1949 recorded in Horodetz (one of the oldest Jewish communities in Russia-Poland) the introduction of lice in an omelette as treatment [58]. In Latin America there are also references to this medical practice. In this case, the remedy would have been brought by the Spanish conquistadors and assimilated by the Spanish American folk medicine in an eclectic form [9]. The recommended number of specimen to take in Chile, Peru, Guatemala and Argentina is 4 or 5 with examples found using measures such as a thimbleful [59–62].

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The key elements of Spanish folk medicine can be found in beliefs and empiricism [50, 63], thus the employed remedies and recipes have been developed primarily through magical conceptions using the homeopathic principle similia similibus curantur or following the natural-philosophical basis of the humoral theory [64]. Keep this in mind, and although the explanations and justifications for taking head lice as an anti-jaundice remedy are complex, it can be hypothesized following two arguments. First, an Aristotelian scheme of thought like Bartholomaeus Anglicus (born before 1203–died 1272) can be used as a starting point. Anglicus applied the humoral theory to the origin of human louse and proposed a hypothesis with a magical explanation of homeopathic type. In chapter LXXXII of his compendium De proprietatibus rerum (“On the Properties of Things”), this author wrote: “lice are begotten of rotten humours that are between the skin and flesh, and fall outside with the sweat”–see Seymur 1975–1988 [65]. Furthermore he classifies them, stating that “those who are begotten from the choleric humour are greenish-yellow”. Choleric humour is synonymous of yellow bile, hence following the principle similia similibus curantur these ectoparasitic insects can be considered a remedy for the treatment of jaundice. This type of reasoning, based on a magical explanation (without rational basis), has been important in therapy throughout history and was highly valued by Classical Greek philosophers such as Empedocles or Plato [66, 67]. Second, folk medicine users also create their own conceptions about health by developing theories with rational bases. For example, in the early 20th century in the Basque Country people still thought that a web in the liver or stomach prevented the normal circulation of bile making it necessary to drill or destroy it. For this reason, the basis of curative applications lies in the belief that the patient should ingest live lice to either break the web or eat it [34, 48]. In Navarre it was explained that when the lice reached the initial part of the intestine they would cause a reaction and help release retained bile [49]. These popular explanations coincide with the description given by Sterpellone [68], who presumed that: “… swallowed lice reaches the stomach and, as they are resistant to the action of gastric juices, pass through the pylorus and enter the duodenum, tickling the walls. This tickle causes contractions in the duodenal wall favouring bile flux and relieving bile stasis which causes jaundice when the bile ducts are blocked due to a mucous stopper.”

In Early Modern history lice intake was described as a “superstitious remedy”, i.e. as a misconception and not accepted by official medicine, which considered it an “illegitimate knowledge”. Despite all, this remedy, typical of oral tradition, has been passed on to us (see Table 1).

At present, folk medicine makes use of the Information and Communication Technology for the transmission and dissemination of knowledge. It is interesting to note that inquiries related to this folk remedy appeared on various websites relating to health and disease management (, in June 2008. The question posed by a user was as follows: “Can head lice given to a person reduce extreme jaundice? Is it true? Please, advise me.” As expert, G M (on June 12, 2008) responded: “I have never heard of any such treatment for jaundice involving head lice. Preferring ‘natural’ cures has its place, but everything that is natural is not necessarily good” (see The previous question and answer reflect popular conceptions about health and disease. Considering that this remedy has been part of our collective knowledge and cultural background, we can state that it is part of a deeply rooted “implicit theory”. Therefore, although the remedy is not currently used in Spain, it is necessary to consider how these ideas have influenced the behaviour of the patients, how they cope with the disease and how to address medical pluralism.

Moreover, this work lies within the context of ethnomedicine and insects, the latter being an animal group of great therapeutic potential. In recent years there have been regularly published reports addressing their importance in the search for new drugs [69–71] and even the pharmacological properties of certain species [72–74] or insect-derived products [75, 76] have been studied. Thus, the present document should serve as a basis and a valuable tool for future chemical screening and biological assays, and should open new perspectives for the economic and cultural assessment of animals traditionally thought of as being of no use.


The use of folk remedy for jaundice based on the ingestion of head lice is difficult to understand due to lack of information on sympathetic or antipathetic associations that were established in the past. However, the survival of this traditional knowledge in Spanish society and its relatively wide geographical distribution helps verify the consistency of the theories formulated within rural communities, even though they may conflict with biomedical health care. It also suggests the need of taking into account the beliefs, ideas and behaviour patterns of popular culture in relation to health and disease for a better understanding with the patient.


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We would like to thank Anne Sherman for her English technical support.

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  1. Departamento de Terapéutica Médico-Quirúrgica, Facultad de Medicina, Universidad de Extremadura, E-06006, Badajoz, Spain
    • José Ramón Vallejo
  2. Grupo de Investigación de Recursos Etnobiológicos del Duero-Douro (GRIRED), Facultad de Biología, Universidad de Salamanca, E-37071, Salamanca, Spain
    • José Antonio González

Corresponding author

Additional information

Competing interests

Both authors declare that they have no competing interests.

Authors’ contributions

The two authors contributed equally during the data collection, data analysis and preparation of the manuscript, and read and approved the final manuscript.

Authors’ original submitted files for images

Below are the links to the authors’ original submitted files for images.

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