Can you tattoo scars

Make sure it is in fact a birthmark and not something malignant like skin cancer. If it is frequently exposed to the sun, I wouldn't recommend it as if it became covered you may not realize that something is wrong. Answer I have a koi tattoo on my arm going over a small birthmark i had, its right by the eye of the koi but is still just as visible as it was before the tattooo although now it just looks like it was intentionally put there, a dark color may cover it but if its a lighter color than your birthmark it will show right through