What you’re noticing on your grandpa’s neck is often something called seborrheic keratosis, a very common, benign skin growth that usually appears after age 50. These spots can look menacing: brown, black, or tan, with a waxy, “stuck‑on” look that easily triggers fears about melanoma. They can show up suddenly, multiply over time, and appear on the chest, back, scalp, or neck, making them hard to ignore.

Despite their dramatic appearance, seborrheic keratoses are not cancer and do not become cancer. The real danger lies in assuming every new or changing spot is “just aging” and never getting it checked. Because they can mimic skin cancer, any growth that changes color, shape, bleeds, or feels different should be examined by a professional. A clinician can usually identify them quickly, sometimes using a dermatoscope, and remove bothersome ones with simple procedures. The best thing you can do is avoid picking, schedule an evaluation, and trade silent dread for clear answers and calm.