Seborrheic keratosis are non-cancerous growths. They are frequently brown but can differ from mild brown to black. They differ in size from a couple millimeters to larger than ten millimeters in diameter. Their key characteristic would be the waxy, “pasted-on” or “trapped-on” appearance. It is generally smaller (lower than 4cm) https://www.sgvascularctr.com/understanding-benign-tumor-treatment-options/