A form of squamous cell carcinoma in situ presenting as a persistent, scaly, or warty plaque involving the nail bed or fold.
A benign vascular tumor, often under the nail, that presents as a small, bluish-red spot and is characterized by paroxysmal, exquisite pain, especially with cold.
A translucent, gelatinous cyst located on the finger near the proximal nail fold, which may cause a longitudinal groove in the nail.
A rare benign tumor of the nail matrix that presents as a thickened, yellowish nail with multiple linear holes or splinter hemorrhages.
A common viral wart (verruca vulgaris) that grows around the nail, often involving the nail fold and subungual space.
A benign, rapidly growing vascular proliferation that presents as a bright red, friable, raspberry-like nodule in the nail fold.
A malignant tumor presenting as a chronic, non-healing, warty, or ulcerative lesion of the nail bed that can destroy the nail plate.
A benign bony growth (osteochondroma) under the nail plate, presenting as a firm, painful nodule that lifts the nail up.
A firm, flesh-colored, fibrous growth emerging from under the proximal nail fold, which is a characteristic sign of tuberous sclerosis (Koenen's tumor).
