Dermatophytosis is also a common bacterial infectious skin disease, mainly caused by acute inflammation in and around the lymphatic vessels in the skin and subcutaneous tissues caused by Streptococcus b haemolyticus infection. The disease can be induced by nose picking, ear pulling, tinea pedis, nail fungus, calf ulcers, diabetes mellitus, and poor body resistance. Clinical manifestations: The disease occurs on the back of the feet, calves, and face, mostly unilaterally. The typical skin rash is a bright red edematous erythema with clear borders and a shiny, tense surface. Infants and elderly people may have nephritis and septicemia. Danemia often has a tendency to recur at the primary site, and repeated attacks can cause chronic lymphedema and the formation of elephantiasis in the lower extremities. Treatment: Penicillin is preferred, and the drug is still needed for 2 weeks to prevent recurrence after the temperature returns to normal. For those who are allergic to penicillin, macrolides, cephalosporins and other antibacterial drugs can be used. Local magnesium sulfate 50% wet compress can be given. It can be supplemented with physical therapy, such as red light, helium-neon laser, etc. Prevention: actively treat the primary foci of infection (such as tinea pedis, nail fungus, etc.) and exercise to strengthen the body’s immunity.