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Microscopic examination revealed areas of fat necrosis and an inflammatory infiltrate consisting of histiocytes and abundant giant cells with radially arranged needle-shaped clefts. The latter were also evident within adipocytes.
Based on the clinical and microscopic findings, a diagnosis of subcutaneous fat necrosis was made. Because of the benign course of this process, observation was recommended. At a 2-month follow-up visit, hair regrowth was observed, and 3 months later, all 3 patches had almost disappeared, with no evidence of scarring or atrophy.
Dark-Red Plaques on the Scalp of a Newborn. Arch Dermatol. 2000;136(12):1559-1564. doi: