AIDS is a chronic infectious disease caused by infection with the human immunodeficiency virus. AIDS patients do not show specific symptoms on their feet. In the acute phase, a rash may appear on the feet. Patients with AIDS may develop secondary infections such as tinea pedis, which in turn leads to erythema and itching on the soles of the feet. 1. Acute phase: The acute phase usually occurs about 1 to 2 weeks after the initial HIV infection. Patients may have fever, sore throat, night sweats, skin rash, joint pain and other symptoms. Among them, the rash has no obvious specificity and can occur in all parts of the body. Therefore, patients in the acute stage of AIDS can have rashes on their feet, which can be manifested as macular rash and maculopapular rash. 2. AIDS stage: patients in the AIDS stage can have infections, tumors, non-infectious inflammatory skin diseases and so on. Among them, infectious skin diseases mainly include skin diseases caused by bacterial, fungal, parasitic and viral infections. Tinea pedis and onychomycosis often occur in the feet. Patients with tinea pedis may experience redness, itching, blisters, and pain on the soles of the feet and the crevices of the toes. Foot symptoms are not specific to AIDS. The diagnosis of AIDS must be based on the results of laboratory tests, and it is recommended to actively consult a doctor for a clear diagnosis, so as not to delay the condition.