Infectious skin diseases mainly include bacterial infectious skin diseases, viral infectious skin diseases, fungal infectious skin diseases and parasitic infectious skin diseases. 1. Bacterial infectious dermatosis: mainly refers to impetigo, skin tuberculosis, gonorrhea or scarlet fever; its main symptoms include skin pustules, rashes, erythema or carbuncles, etc., which can be transmitted through contact, air droplets or respiratory tract. 2. Viral infectious skin diseases: mainly refers to common warts, herpes simplex, herpes zoster, hand, foot and mouth disease or AIDS, etc.; its main symptoms include blisters, papules, erythema or warts, etc., which can be transmitted through contact, fecal-oral, blood, mother-to-child or sex. 3. Fungal infections of the skin: mainly including ringworm, tinea capitis or onychomycosis, etc. Its main symptoms include blisters, erythema or papules, etc. It can be transmitted through contact. 4. Parasitic infectious skin diseases: mainly including scabies, head lice, pubic lice, etc., mainly spread through close contact. Infectious skin diseases are recommended to consult a doctor for a clear diagnosis and symptomatic treatment in order to avoid delays.