A small bump on the surface of the nail may be related to psoriasis, lichen planus, onychomycosis and nail trauma.
1. psoriasis nail: psoriasis is a kind of lesion that involves the nails and leads to abnormalities of the nails, which is mainly manifested as thimble-like holes on the surface of the nails, accompanied by thickening of the nails, separation of the nails, and accumulation of pus under the nails and other phenomena.
2. Nail lichen planus: lichen planus is a chronic inflammatory skin disease, when it involves the nails, it can lead to thickening of the nail skin, unevenness and roughness of the nail surface.
3. Onychomycosis: it is a disease caused by the infection of nails with ringworm bacteria. As the ringworm bacteria can damage the keratin, the surface of nails may be rough, thickened and uneven.
4. Nail trauma: due to the nail plate or nail bed is damaged, resulting in the newborn nail form abnormal and a kind of change.
Due to the complexity of the cause of the disease, it is necessary to consult a doctor and complete the relevant examinations.