Goose bumps on the arms, clinically known as periapical keratosis, is actually due to abnormal keratinization of the hair follicle mouth, sebum can not be discharged normally, keratinization of the hair follicle mouth accumulation leads to localized like goose bumps, hand touch is brown hands, often occurs in adolescents, especially in winter or autumn when the skin is dry is more obvious. In terms of treatment, you can take vitamin A pills and other vitamin drugs orally, and use topical adapalene gel, retinoic acid cream, tazarotene gel, etc., to improve keratinization, and you can also use fruit acids for treatment when available.