People with no medical degree & who have not even seen the red spot should keep such emotively scary views to themselves.
Cancer - sure - & you're an alien as well!!
My 10 year old son who has exzema sometimes gets red lumps/rashes/pimple like spots on his penis - as did my husband as a child - we put antiseptic/antibacterial soothing creams on the spots & they go away - no problem. That said & as I can not see the spot myself I would suggest that you go see a doctor just to be safe.