The use of tincture of azelaic acid hydrochloride on the body turned black is due to the drug reaction caused by skin pigmentation, usually will recover on their own, if necessary, can be accelerated by the reasonable use of drugs to recover. Nitrogen mustard tincture hydrochloride is a commonly used drugs for the treatment of vitiligo, some patients in the use of the process of the affected areas of the skin blackened, red and other cases, is a normal reaction to the use of drugs, usually in the discontinuation of the drug after 3 to 6 months of time, with the metabolism of the skin will be naturally restored. After the use of tincture of azelaic acid hydrochloride, it is recommended to do a good job of sun protection, to avoid the use of medicine parts of the direct exposure to ultraviolet radiation, if necessary, can follow the doctor’s instructions oral vitamin E capsules, to speed up the recovery of skin color. The use of tincture of azelaic acid hydrochloride darkened body is usually a normal phenomenon, do not worry too much, if during the use of the drug also appeared other physical discomfort, it is recommended to go to the hospital in a timely manner. The above drugs need to be used under the guidance of a doctor.