Dermatology is a relatively common superficial lymphitis caused by Streptococcus haemolyticus infection. The second is due to other skin diseases. Second, secondary infections caused by other skin diseases, such as maculopapular rash, eczema, secondary infections will appear large areas of oozing, breaking, also easy to cause dermatitis. Thirdly, fungal infectious skin disease can easily cause dermatophytosis, and if the patient has foot fungus and repeatedly does not heal and breaks down, it can easily cause dermatophytosis in both lower limbs.