Cutaneous horn: A mask to underlying malignancy.

Area of Science:

• Dermatology
• Oncology

Background:

• Cutaneous horns (cornu cutaneum) are characterized by excessive hyperkeratosis, clinically presenting as horn-like growths.
• These lesions commonly appear on sun-exposed areas, with a significant proportion (60%) being benign.

Observation:

• The clinical presentation of cutaneous horns can mimic various benign and malignant skin conditions.
• Differential diagnoses include keratosis, verruca, and several types of skin cancer such as basal cell carcinoma and malignant melanoma.

Findings:

• This report details a rare case of a cutaneous horn located on the upper lip vermillion.
• The cutaneous horn masked an underlying malignant lesion, emphasizing the importance of thorough investigation.

Implications:

• Cutaneous horns necessitate careful evaluation to rule out or confirm associated malignancies.
• Early detection and diagnosis are crucial for effective management of potentially underlying skin cancers.