A red blister on the skin may be caused by eczema, herpes zoster, herpetic dermatosis and other causes, different causes of different treatments, commonly used treatments based on drug therapy. 1. eczema: if the patient blisters appear a lot of oozing, you can follow the doctor’s instructions to use 3% boric acid solution, 0.1% ethacridine solution for local cold wet compresses, but also follow the doctor’s instructions to use dexamethasone cream, mometasone furoate and other drugs for local application, but also through the oral antihistamines such as chlortetracycline and other medications for treatment. 2. Herpes zoster: patients can follow the doctor’s instructions to use antiviral drugs for treatment, such as acyclovir ointment, famciclovir capsules. If the patient has pain, you can also use acetaminophen tablets, tramadol tablets and other pain relieving drugs for treatment, the patient can also be localized heat therapy to promote the recession of skin lesions. 3. Herpetic dermatosis: such as pemphigus and other diseases, there will also be a red blister on the skin. At this time you need to give oral glucocorticoid drugs such as prednisone, dexamethasone or immunosuppressants such as azathioprine, combined with topical hormone creams such as halometasone, fluticasone propionate ointment and other drugs. There are many reasons for a red blister on the skin, the specific causes need to go to the hospital to determine the cause of the examination, diagnosis and treatment as prescribed by the doctor, the patient should be regularly to the hospital for review, the doctor can be adjusted according to the situation of the review of the treatment program. Drugs need to be used in accordance with medical advice.