Man you need to stop skipping you warmups. I remember you once made a thread about skipping warm ups and even Big Al warned you that you might injure yourself if you do and you shouldn't do PE if you have this kind of attitude. Warm ups and warm downs are one of the most (if not the most) important part of PE and you should never skip them. You should be glad it's nothing serious it could've been much worse.
Anyway if you do feel any pain then you should take break from PE now and try to message your penis from time to time gently with a warm piece of cloth (soak it in warm/hot water). And please be more careful next time.