Rash after chemotherapy, consider the following reasons: 1, chemotherapy drug side effects, mild chemotherapy drug allergy rash; 2, chemotherapy appeared after the immune deficiency caused by herpes zoster. Rash after chemotherapy, first to clarify the cause of the disease. If the rash is caused by chemotherapy drugs, it is recommended to apply calcium gluconate, vitamin C, and anti-allergy drugs, such as paracetamol and cetirizine. If herpes zoster is caused by immunocompromise after chemotherapy, antiviral treatment is recommended to improve the body’s immunity treatment. If there is pain, it is recommended to carry out pain relief symptomatic treatment. Therefore, chemotherapy rash should first clarify the cause of the disease, and then according to the cause of the corresponding treatment.