If you see blood coming out your man penis what is that?

Here are some ...: Seeing blood out of penis denotes some injury to the vessels of the lining of urinary tract by infection, inflammation of undetermined causes, tumor, stone, obstruction, trauma or self-inflicting, etc. So, work closely with Doc for reviewing detailed Hx + conducting physicals + timely testing as needed do to deduce accurate Dx and receiving reasonable care timely. Best wish ...

Hematuria: Blood coming out of penis is hematuria. This can be painless or painful. If former, we worry about cancer or side effect of blood thinner. If latter, we think of infections & stones. Regardless, this needs to be evaluated by his family doc.

Blood: Most likely blood. Could be from trauma to the penis, bladder /kidney infection, kidney stones/mass, prostate infection or trauma/mass, sexually transmitted disease, or kidney failure, acute or chronic disease. Needs to be seen by Doc for evaluation.