Sudden darkening of the appearance of the back of the hand may be caused by ultraviolet radiation, micronutrient deficiencies, neurodermatitis and other reasons.
1. Ultraviolet radiation: When you are engaged in outdoor work or activities for a long time, ultraviolet radiation will radiate the skin on the back of the hand for a long time, leading to an increase in pigmentation, which can lead to a sudden blackening of the back of the hand.
2. Lack of trace elements: when the body lacks certain trace elements, such as niacin, it will lead to abnormal melanin production, which can cause the appearance of the back of the hands suddenly black.
3. Neurodermatitis: when neurodermatitis occurs on the back of the hand, due to the continuous stimulation of local inflammation, resulting in melanin deposition, can cause local skin discoloration, resulting in the appearance of the back of the hand suddenly black situation.
The back of the hand appearance suddenly black situation, need to go to the hospital in time to do the relevant examination, clear cause, and then targeted treatment.