As long as it doesn't change color or get rough edges it's probably fine. It's not really size, it's changes in color, texture and shape that you need to be concerned with. I had a melanoma mole that the doctor said was the largest he'd ever seen and I was probably going to die. After horrible and deforming surgery on thigh and groin my lymph nodes were clean. So I think the medical community should stop saying size means anything. That was almost 28 years ago & that doctor is thrilled he was wrong.