Seborrheic Keratosis

Seborrheic keratosis is a common noncancerous skin growth that often develops in middle age or later. It may look brown, black, tan, or yellow, and its surface can seem rough, waxy, or stuck-on.

These growths are not contagious and do not turn into cancer. They can appear on the chest, back, neck, scalp, face, or arms, and many people develop more than one over time.

Doctors do not know the exact cause, but aging, genetics, sun exposure, and repeated skin friction may play a role. Because they can resemble warts or other skin lesions, a medical check can help confirm the diagnosis.

Treatment is usually unnecessary unless the lesion is irritated, itchy, bleeding, or cosmetically unwanted. Common removal methods include cryotherapy, shave excision, curettage, electrodesiccation, or laser treatment.