Hi and welcome to HCM.
This is common injury
and it seems like you had contusion
or perineal region which is causing pain and numbness
in this area. It usually pass spontaneously in several days.There shouldnt be serious nerve damage
. Take some of the standard painkillers and if doenst pass in 3-4 days you should visit doctor for further tests. ALso,watch for some abnormal signs such as blood in urine or stool,defecation pain or urinating pain u should visit doctor earlier. WIsh you good health.