Summer hand back wrist sweat white black may be because of ultraviolet radiation, folliculitis, eczema and other reasons.
1. ultraviolet radiation: after entering the summer, the outside temperature gradually increased, ultraviolet rays become stronger and stronger, if you usually go out and do not pay attention to the back of the hands and wrists parts of the sun, long time by the ultraviolet radiation, there may be pigmentation, which led to the back of the hands and wrists sweating in the summer white and black.
2. Folliculitis: summer sweaty hands and wrists, do not pay attention to local skin care, there may be bacterial or fungal infections caused by inflammatory lesions of the hair follicles, resulting in hair follicles in a congested state, which generally leads to local blood circulation is not good, and can easily lead to local whitening and blackening of the situation.
3. Eczema: may be due to summer sweat on the back of the hands and wrists, stimulate the local skin, caused by eczema, may appear lesions, in the recovery process may be due to pigmentation, resulting in whitening and blackening of the situation.
If the patient sweating on the back of the hand and wrist whitening black in summer, it is recommended to go to the hospital in a timely manner to find out the cause of the disease, under the guidance of the doctor for treatment.