Onychomycosis is the nail disease responsible for 50% of onychopathies. The most common clinical form is distal and lateral onychomycosis. The dermoscopic finding of subungual hyperkeratosis in “ruin appearance” in the nail free margin is a relevant diagnostic clue and, when present, suggests the diagnosis of onychomycosis.

Keywords: Dermoscopy; Nail diseases; Onychomycosis

The “harpoon nail” is a variant of the ingrown toenail. In this condition, the nail spicule pierces the distally growing periungual tissue and may emerge through the hyponychium. Its diagnosis can be confirmed by high-frequency ultrasound, facilitating the therapeutic programming.

Keywords: Dermoscopy; Nail diseases; Onychomycosis