What are the methods for treating crabs?

Patient's question:

Detailed medical condition and consultation purpose: Discovered pubic lice and treated with alcohol disinfection, experiencing itching and pain
Duration of onset and current duration: Two days
Current general condition: Some itching and pain
Medical history: Recently discovered
Auxiliary tests:
Previous diagnoses and treatment history and effectiveness:
Other:

Doctor's answer:

Hello: The perineum should not be disinfected with alcohol. It is acceptable to disinfect the pubic hair area alone, but it is ineffective for treating pubic lice. Lice are ectoparasites and can be divided into three types based on their species, morphology, and sites of infestation:
　 (1) Body lice: These lice infest clothing seams and are also known as cloth lice.
　 (2) Head lice: These lice infest the hair and lay eggs.
　 (3) Pubic lice: These lice infest the pubic hair.
　 Pubic lice are almost exclusively transmitted through sexual contact. Couples often contract the condition simultaneously, so it is considered a sexually transmitted infection. Pubic lice attach firmly to the base of the pubic hair or adhere to the surface of the pubic region using their hook-like feet to feed on human blood. They also release venom from their saliva, causing localized itching and inflammatory reactions, such as red papules or eczema-like changes. Pubic lice are easily cured by shaving the pubic hair and burning it to eliminate their infestation conditions.
　 Over-the-counter lice treatments include:
　 ① Urea cream: Apply locally twice daily for 5–7 days.
　 ② Jintling ointment: Sprinkle locally to kill lice.