An apparently simple cutaneous horn of the lid margin was found to be the manifestation of an underlying occult sebaceous carcinoma of the eyelid.
The case is reported because it is not generally recognized that a cutaneous horn may be the sign of a sebaceous carcinoma, which is best initially treated by adequate excision.
Brauninger GE, Hood CI, Worthen DM. Sebaceous Carcinoma of Lid Margin Masquerading as Cutaneous Horn. Arch Ophthalmol. 1973;90(5):380-381. doi:10.1001/archopht.1973.01000050382009