The Tatt2away® Tattoo Removal System (US Patent 8,663,162) works using a similar
technique to how a tattoo is applied:

The skin is lightly abraded in a patented pattern to reduce scarring
A patented solution developed by Rejuvetek Medical called TEPRSOL® is introduced instead of ink

TEPRSOL® produces an escharotic response in the skin that relies on the body’s natural healing response to reject the ink from the body in the form of a scab, actually removing the ink from the body.

Tatt2Away® treatments are designed to remove the tattoo in a series of visits for maximum results. The number of treatments depends on the size complexity, and location of the design. An average size tattoo (4 inches by 4 inches), may need four or five visits but is realistically determined during the initial consultation.

Discomfort from the procedure is comparable to that of a tattoo being applied. Treatment sessions last about 20-30 minutes and time between treatment sessions is usually about six-eight weeks.