If you have flat warts and white spots on the back of your hands, you can use medication and physical therapy under the advice of your doctor. 1. medication: flat warts are caused by the human body infected with HPV virus, in the back of the hand can appear flat pimples, some patients will appear itching and accompanied by white spots, you can choose salicylic acid ointment, fluorouracil ointment and other topical medication. 2. Physical therapy: If the number of flat warts on the back of the hand is relatively small, according to their own actual situation, in the doctor’s advice through freezing, electrocautery, laser and other physical methods of treatment, can make the lesions are destroyed and clear. You should avoid sharing items with people with flat warts, keep your hands hygienic and clean, avoid scratching, and pay attention to the nutrition and balance of your diet. The actual warts are recommended in the hospital, the doctor’s medication should be used in accordance with the doctor’s instructions.