Due to the bruising experienced during the process of getting a tattoo, the skin tends to secrete a fluid which forms tiny drops on the surface. In a normal situation, the blood particles in the fluid would dry on the surface and end up looking like black specs, this situation would be most likely to result if you did not bother the bruises.
The fluid would dry on the surface along with the particles and then form what most people know as a scab. The skin would eventually heal despite the various problems otherwise if the process is disturbed or interrupted, you might have to deal with healing a tattoo which is infected. » Read more: Tattoo – No More Infected Tattoos