A female newborn of non-consanguineous parents, delivered at term via caesarean section, presented with a sharply bordered ulceration reaching from the left parasternal line to the left posterior axillary line (figure 1A).

(A) Photo on day 1 of life: The lesion was fibrin-coated in the center, necrotic at the margins with livid discoloration of surrounding skin parts, mobile and non-tender. (B) Photo after 8 months under conservative treatment. (C) Hematoxylin and eosin stain of the biopsy from the margin of the ulcer showing deep tissue necrosis and reactive blood-vessel proliferation with fibrosis and hemosiderin …