We agree with Dr Richfield's comments that the presence of a sebaceous gland on the sole is a rare finding. Unfortunately, too few biopsy specimens are secured from the sole to furnish a meaningful estimate as to how unusual this occurrence may actually be. Ectopic follicular structures do occur on the palm,1 and this may be the explanation for our biopsy finding.
Petrozzi JW, Wood M, Tisa V. Sebaceous Gland on Sole of Foot?-Reply. Arch Dermatol. 1980;116(4):383. doi:10.1001/archderm.1980.01640280019009