The appearance of white blisters on the arms needs to be scrutinized for the appearance of the white blisters. If such white blisters become keratinization-like changes when touched by hand and are densely arranged on the outer edges of the upper arms on both sides, it is considered possible that the condition is an early stage of follicular keratosis pilaris. This condition is caused by genetic factors and does not affect the body too much, so it can be ignored. If you want to improve, you can apply compound lactic acid cream or adapalene gel treatment, there is a certain improvement effect. If the small white blisters on the arm are unilaterally distributed, accompanied by obvious pain, around which a reddish light stain can be seen, it is considered that it may be caused by herpes zoster after viral infection. It is recommended to choose to use oral vasiclovir hydrochloride, topical glycerite lotion comprehensive treatment. If the small white blisters are pimple-like changes, on top of which can be seen depressed dots, it is considered that it may be infectious molluscum contagiosum, and it is necessary to remove the molluscum contagiosum inside, in order to achieve the purpose of treatment.