hello welcome to hcm.
it seem that the cut from falling from four wheeler had got infected.
it does not matter if you apply soap or not.even water can cause infection.
avoid water in the hip area and make it a point that it remains dry for most of time.
you have to apply some local antibiotics cream as well as oral antibiotics
take some pain killer to relief pain.
you can apply betadine
ointment over wound 3 -4 times a day .oral antibiotics like tab augmentin
625 mg three times a day for 5 days .you be all right .if not responding in 5 day then go to your family doctor who examine u and tell further management.
wish u good health.