A red rash on the arm may be caused by papular urticaria, contact dermatitis, after diagnosis, should be based on the cause of drug treatment.
1. Pemphigus urticaria: can be used externally with glycerine lotion, dexamethasone cream, hydrocortisone butyrate cream and other drugs for treatment, with anti-inflammatory and anti-itching effect, when there is a secondary infection, with the application of mupirocin ointment, fusidic acid cream and other antibacterial drugs treatment.
2. Contact dermatitis: local contact with irritating or allergic substances appear erythema, papules, blisters with itching symptoms, should be avoided in time to avoid contact with such substances, can be externally 3% boric acid solution, zinc oxide oil and other drugs for treatment, but also with the oral antihistamine drugs for treatment, such as loratadine, cetirizine, etc..
Arm a red rash should be timely consultation, in the process of treatment, need to follow the doctor’s instructions, reasonable use of drugs, not indiscriminate use of medication.