As with any procedure, there are risks and benefits. The most common side effect is an incomplete removal of the tattoo ink, despite undergoing multiple treatments. It’s impossible to predict which tattoos will respond completely and which won’t, and it’s only once the process has begun that these issues become more evident. Occasionally, the texture or pigment of the treated skin may change, and certain tattoo colors such as white, bright colors, and flesh colors can have a reaction that makes them turn black immediately following treatment. These "black reactions" can be treated with a laser, but this will increase the number of treatment sessions required.