SUBEPIDERMAL CALCIFIED NODULE OF THE EAR IN A CHILD WITH HAIR FOLLICLE NEVUS

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Abstract
A 9‐year‐old Korean boy visited the Department of Dermatology, Yonsei University Wonju College of Medicine, with a nodule on the right earlobe with pruritus for 6 months. His past medical history and family history were unremarkable. Physical examination revealed a 5 mm diameter, oval, firm, erythematous nodule on the helix of his right earlobe (Fig. 1). He denied any antecedent trauma. Histopathologic examination of an excisional biopsy specimen showed epidermal hyperplasia and focal parakeratosis. In the upper dermis there were focal collections of deep blue staining calcified material surrounded by some lymphocytes and histiocytes (Fig. 2). The surrounding dermis contained numerous small, well‐differentiated hair follicles with thick fibrous root sheaths and some sebaceous glands connected with the hair follicles (Fig. 3). Von Kossa stain confirmed the impression that the nodules consisted of calcium. Serum calcium and phosphorus levels were normal.

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