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To the Editor.—
In 1979, we reported a case of melanoacanthomas of the lip.1 Two hyperpigmented, slightly raised plaques had developed on the upper lip of an 18-year-old black woman. These were present in the area of her lips that came in contact with cigarettes. A skin biopsy specimen showed profuse numbers of dendritic melanocytes scattered throughout all levels of the acanthotic epidermis. We would like to present the results of a follow-up examination of the patient's lesions.
Report of a Case.—
A former one-pack-a-day smoker stated that lesions that had been present on her upper lip had disappeared within two months after cessation of smoking. When she was examined, her lips appeared totally normal.
It has been previously theorized that melanoacanthomas are actually irritated seborrheic keratosis.2,3 Our observations suggest that melanoacanthomas may be related to trauma or irritation to the skin and, therefore, are potentially reversible.
Matsuoka LY, Barsky S, Glasser S. Melanoacanthoma of the Lip. Arch Dermatol. 1982;118(5):290. doi:10.1001/archderm.1982.01650170004004