Flat warts are pinhead-sized, smooth, flat-topped, and raised bumps on the skin. They usually appear as clusters and are caused by human papillomavirus (HPV). They are more common in children, with the face and legs being the commonest sites.
Flat Warts - Causes, Symptoms, Diagnosis, and Prevention
Flat warts are small, smooth bumps on the skin. They are flatter and smaller than other warts and appear in clusters on the face or hands.