There are a lot of white dots on the arm to consider is florid chaff rash, vitiligo and so on, the main method is drug treatment, according to the specific cause of the disease to choose the appropriate drugs. 1. florid chafing: florid chafing is a fungal infection caused by Malassezia violating the cuticle of the skin, mainly the use of antifungal drug treatment, can be applied locally clotrimazole, terbinafine cream and other antifungal drugs. If the lesion area is large and serious, the effect of using local medication alone is not obvious, you can take itraconazole and other drugs orally. Pay attention to personal hygiene, avoid scratching the skin. 2. Vitiligo: Vitiligo and melanocyte destruction has a relationship, the main symptom is also the appearance of white spots, generally need systematic treatment, you can apply halometasone, compound flumethasone and other glucocorticoid drugs. The skin lesion progression can also be oral prednisone, intramuscular injection of compound betamethasone injection, as soon as possible to control the condition. There are a lot of white dots on the arm, you should go to the hospital in time to check, for the cause of the symptomatic treatment, if you need to use drugs, you should follow the doctor’s instructions to use, not to use without authorization.