That small, unsettling bump on your grandpa’s neck is often something called seborrheic keratosis—a very common, benign skin growth that tends to appear after age 50. These spots can look alarming: brown, black, or tan, with a waxy, “stuck‑on” surface that makes them easy to confuse with skin cancer. They may arrive one at a time or in scattered patches, sometimes seeming to appear almost overnight on the chest, back, scalp, or neck.

Despite their ominous appearance, seborrheic keratoses are not cancer and do not become cancer. The danger lies in assuming everything is harmless. Any spot that changes, bleeds, or looks irregular should be examined. A clinician can usually recognize them quickly, sometimes using a dermatoscope, and remove bothersome ones by freezing or gentle scraping. The real power is in refusing to ignore what worries you—getting it checked, and trading silent fear for clear, informed reassurance.