A 22-year-old man presented with an 18-month history of a slow-growing, asymptomatic nodular lesion on his upper lip. Physical examination revealed a dark-red, firm, dome-shaped nodule, measuring 8 mm in diameter, with an adherent scale covering the central part of its surface (Figure 1 and Figure 2). The patient appeared to be in good general health, and routine laboratory investigations showed no abnormalities. The lesion was completely excised for light microscopic examination (Figure 3).
Caputo R, Marzano AV, Gianotti R. Asymptomatic Nodule on the Upper Lip—Quiz Case. Arch Dermatol. 2003;139(3):381-386. doi:10.1001/archderm.139.3.381-a