So Rosco has two more on his forehead. The last one he had was on his cheek and came off after about a month. Do they ususally come back like that? How big can they get before needing to see a vet? Their small, but I'm just not sure about them.

A skin tag is a common, benign condition which consists of a bit of skin that projects from the surrounding skin and may appear attached to the skin. Skin tags can vary quite a bit in appearance. They may be smooth or irregular, flesh colored or more deeply pigmented, and either simply be raised above the surrounding skin or have a stalk (a peduncle) so that the skin tag hangs from the skin.

Skin tags can occur almost anywhere there is skin. However, favorite areas for tags are the eyelids, neck, armpits (axillae), upper chest, and groin.