The causes of small transparent blisters on the arms are mainly considered as the following: 1. Consider viral skin diseases, such as herpes zoster, commonly seen unilaterally on the upper limbs can see erythema, papules, clustered blisters, accompanied by pain, which is a viral skin disease caused by varicella-zoster virus. The duration of the disease is less than six weeks, mainly due to internal and external factors that cause chronic inflammatory allergic skin disease of the skin. In terms of treatment, oral glycopyrrolate tablets and olopatadine hydrochloride tablets can be taken. In terms of topical medication, if there are not many rice-like blisters, then glycopyrrolate lotion can be applied. If there are a lot of blisters and they are very large, this can be treated by a sterile syringe to draw blisters after iodophor cleansing, followed by the application of a mixture of sea Zhi oil and recombinant human epidermal growth factor gel for topical application. Therefore, for patients with small clear blisters on the arms, it is recommended to go to a regular hospital and be treated under the guidance of a dermatologist.