Which lesion is described as having a stuck-on appearance?

• A. Seborrheic keratosis
• B. Actinic keratosis
• C. Lentigo
• D. Pyogenic granuloma

Answer: (A)

The phrase "stuck-on appearance" is a classic description of seborrheic keratosis. These benign epidermal tumors form flat to slightly raised, pigmented plaques that look as if they’ve been pasted onto the skin, with well-defined borders and a waxy or verrucous surface. This distinctive look helps differentiate it from other common lesions: actinic keratosis tends to be rough, scaly, and sun-exposed; lentigo is usually a flat pigmented macule without elevation; pyogenic granuloma is a bright red, friable vascular growth that bleeds easily. So the stuck-on, waxy plaque is most characteristic of seborrheic keratosis.