The skin of pubic lice will show symptoms such as pimples and scratches. 1. Pimples: Pubic lice will suck human blood after parasitizing the human body, due to the toxins and allergens contained in their saliva, which will lead to skin redness, pimples and other symptoms, and some patients may have green ecchymosis. 2. Scratches: pubic lice bite the skin will appear intense itching, due to local itching patients will continue to scratch with their hands, there can be obvious scratches, breakouts and other manifestations. Pubic lice is a contagious skin disease, once diagnosed, it is recommended to go to the hospital in a timely manner, avoid sexual behavior during the treatment period, and sexual partners should also receive the appropriate examination and treatment.