A bruise (contusion) is a soft-tissue injury. A bruise occurs when small blood vessels near the surface of the skin are damaged. This causes blood to leak out under the skin. An external genital contusion is most often due to a bump, blow, or fall. Symptoms include pain or soreness and swelling. The bruise will cause skin discoloration. As it heals, it will likely turn from red, purple, blue, or greenish coloring to a light yellow. This is normal.
In general, no tests are required. If your injury seems to be severe, an imaging test may be done to check the extent of the damage. Most bruises heal without treatment in about 1 to 2 weeks.