You have two options- laser or coverup. Coverup=more tattoos!
Laser treatment is quite well established. It is very effective and breaks up the ink particles in your skin, it can take a few visits though depending on size/colour/skin type/quality of tattoo.
There are often deals for it in groupon etc- buy 5 hours get 1 free type of thing. A lot of tattoo shops do it, some beauticians do it but I'd be more inclined to use a tattooist as chances are that they do it more often and so are more specialised.