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A case of lymphangioma circumscriptum developed on the finger.

A 16-year-old girl presented with an enlarging, asymptomatic papule on the finger that had been noticed for 2 weeks. Physical examination revealed a 0.5 0.5-cm, nontender, well-demarcated, domeshaped, skin-colored papule on her left thumb (Figure 1). Her physical examination revealed no significant abnormality other than the skin lesion. The lesion first developed 1 year previously, and CO2 laser ablation was performed at another clinic. With time, the lesion grew slowly, and she then visited our clinic for removal of the lesion. A punch skin biopsy was performed under the impression of wart or hypertrophic scar. The histopathologic examination showed numerous dilated lymphatics in the papillary and upper reticular dermis, and there was pinkish fluid in their lumina. There was hyperkeratosis and acanthosis in the overlying epidermis and numerous vascular structures and thickened, compact, eosinophilic collagen bundles in the reticular dermis (Figure 2). On the immunohistochemistry, CD34 was positive, but carcinoembryonic antigen (CEA), epithelial membrane antigen (EMA), S-100, and factor VIII-related antigen (FVIII-RA) were negative. After the diagnosis of lymphangioma circumscriptum, the patient did not undergo any other treatment.