Black fingernails may be due to trauma, onychomycosis, onychomycosis, etc. It is necessary to clarify the cause of the disease and treat the symptoms, but it is generally difficult to be treated by washing nails.
1. Trauma: nails are pinched or smashed, which may lead to nail plate damage, rupture of tissues and capillaries under the nail plate, resulting in bleeding, blood stasis and coagulation, and the nails are black. Generally, it will fade away with the gradual growth of nails, and no special treatment is needed.
2. Nail nevus: Nail nevus may be caused by the melanin produced by the nevus cells and deposited on the nail plate, manifesting as a black band with clear and regular boundary, which belongs to benign tumors and generally does not need treatment; however, if there are symptoms such as erythema and the black band becomes wider in a short period of time, it needs to be removed in time in order to prevent cancerous transformation.
4. Onychomycosis: commonly known as “gray nails”, it is caused by dermatophyte infection, which can be manifested as turbidity, discoloration, separation and other symptoms, separation of nail bed and nail plate may lead to pustular green bacillus colonization in the interspace, which leads to black nails. It can be applied externally with drugs such as amorolfine and cyclopyrrolidine application, and can be treated with oral antifungal drugs such as terbinafine and itraconazole.
Fingernails black may also be due to other reasons, need to clarify the cause of the disease, under the guidance of the doctor standardized treatment, avoid private medication, so as not to delay the condition.