Nails turned black may be related to factors such as subnail bruise, onychomatous nevus, and subnail melanocytoma.
1. Subnail bruise: Subnail bruise may cause nails to turn black, and cause patients to appear subnail bruise may be related to nail trauma, platelet lowering, fibrinogen abnormality and other factors.
2. Nail nevus: Nail nevus refers to the pigmented nevus that occurs in the nail matrix, which is manifested as longitudinal pigmented streaks on the nail plate, and may lead to blackening of nails.
3. Subungual melanoma: Subungual melanoma is a kind of malignant tumor of melanocytes, and this condition may also lead to the above symptoms.
There may be other reasons for the darkening of nails, it is recommended to go to the hospital in time for relevant examinations, after clarifying the cause of the disease, actively treat the symptoms.