Pediculosis is a kind of itchy skin disease caused by lice parasitic on human skin. The reaction to tick bites varies from person to person. After repeated bites, there will be sensitive reactions, such as itching and rash. Some people will not react after repeated bites. The first bite has no reaction. The treatment principle is to kill insects and eggs. The head lice and pubic lice should be shaved first. The commonly used drugs are 50% baibu tincture (Chinese medicine baibu is immersed in dilute alcohol or Baijiu, filtered for use after 24h), 20% benzyl benzoate emulsion, etc. The disease is mostly transmitted by sexual contact, and very few can also be infected by sharing bedding and clothing with patients, which may be related to the low activity of pubic lice. It can coexist with other sexually transmitted diseases. According to foreign data, about 1/3 of the patients have other sexually transmitted diseases. Most of them are only affected by pubic hair, but they often extend to the hair around the anus, and can also affect armpits, eyelashes, eyebrows, whiskers, body hair on the trunk, abdomen, legs, and very few can affect hair.
The lice are hard to see with the naked eye. This wingless insect can easily infect other people by touching or sharing clothes or other personal items. Head lice and body lice are very similar, but in fact they are different species. The pubic louse is thicker and shorter than the first two, and its round shape is very similar to crab. In English, the common name of pubic louse is the same as crab. Both head lice and pubic lice are directly parasitic on humans; Body lice are often found on clothing in contact with skin.
It is a kind of itchy skin disease caused by lice parasitizing on human skin.
（2） Pathogenesis Pathogenesis
The reaction to tick bites varies from person to person. After repeated bites, there will be sensitive reactions, such as itching and rash. Some people will not react after repeated bites. Because the first bite does not produce a reaction, the pathogenesis is still not very clear, and may be related to the allergen.