[Ingrown nails or onychocryptosis].

Ingrown nails come down to a conflict between the nail plate and the periungual tissue, causing pain, morbidity and impairment. The feet are mainly affected. The treatments are numerous: medical, podiatric, or surgical. Surgical management has two approaches: the techniques focused on the periungual skin and those on the nail plate. Among the latter, partial nail avulsion followed by matrix phenolization, known as "Boll's technique", is still highly regarded.