Hi and welcome Carrie
It really depends on the size, type and depth of the scar as well as the age.
For example a burn scar is harder to tattoo over than a surface scratch scar etc.
Any chance of a photo to advise better.
If you are not comfortable send me a PM and I can pass over my email or ask one of the artists Outlaw, Izzarasink or S.Neil if they can check the photo for an opinion.
Take Care
Matthew