Nothing. Semen on the skin is harmless.
If semen were to enter the bloodstream through a break in the skin or mucous membrane, it could potentially introduce sperm cells into the circulatory system. This could lead to an immune response as the body recognizes the sperm as foreign invaders and attacks them. Additionally, there is a risk of infection if the semen was contaminated with bacteria or viruses.
it would burn your skin
It is possible for people to be allergic to semen. - Perhaps that is the cause.
you can get skin cancer
Nothing would happen.
Semen contains proteins that can adhere to skin, making it harder to rinse off with water alone. The proteins in semen can create a sticky texture that causes it to cling to the skin surface. Washing with soap may help to break down these proteins and remove the semen more effectively.
Nothing would happen as it would just go onto your skin
Your blood and your organs would probably fall out.
they would die
Your hair would fall out and your skin would get all scabby.
we would over heat
they would die