Melasma Overview. Patches of melasma are darker than other areas of skin because they have more pigment. The cells that produce pigment in the skin are called melanocytes. Ultraviolet radiation, or UV rays, from the sun stimulate melanocytes to produce pigment.
The human testicle .The two muscles that regulate the temperature of the testes are the dartos andcremaster muscles:â¢ Dartos Muscle The dartos muscle is a layer of smooth muscle fibers in the subcutaneous tissue of thescrotum (surrounding the scrotum).
Sweating of the testicles is normal as this is another mechanism your body uses to keep your testicles and sperm at the right temperature. When your testicles sweat, this helps reduce the temperature of your testicles, and thus, the temperature of your sperm (if things are getting too hot down below).