Rash may have the following conditions: 1, bacterial infection caused by impetigo: can appear erythema, pustules, pustules; mainly due to the body’s immune system decline, resulting in Staphylococcus aureus infection, patients can oral azithromycin granules, topical clindamycin phosphate gel for treatment; 2, shingles and other viral infections: also due to poor rest and sleep or excessive anger, exertion caused by a decline in immunity The patient can take oral famciclovir tablets and apply topical acyclovir ointment; 3, eczema caused by allergy: mainly due to sun allergy or drug allergy, or over-eating beef, mutton, seafood and other hair products caused by allergy, can be treated with topical dinaide ointment.