Is a skin tag with a base about the size of a dime cause for concern? The "tag" part takes up about 1/3 of the area. Can this turn to melanoma?

Hmmmmmmm. Skin tags have small bases. They are pedunculated. A widely based skin lesion is not a skin tag. Any skin growth greater than 1 centimeter, or that is changing, should be checked by a dermatologist. Btw a dime is larger than a centimeter.
Firstis . Firstis the skin tag growing? Is it bleedding? Any skin lession this size should be seen by a physcian and possible be removed.