I have a lump above my penis but it happened after getting punched what do you think it could be. It's big and hard?

Need more info... Without more specifics, relevance, & sequence of events of all related symptoms & signs, it is impossible to offer right diagnosis but a guess or conundrum, although, clinically, it could be just a sebaceous cyst or fat nodule. To confirm it, follow instructions described in http://formefirst.com/eNewsletter06.html; then you surely can work closer/ better with doc for most reasonable care. Best...