hi vannababy, what you have described seems like a soft tissue injury
to me and as there is no fracture
you can just give that hand some rest, cold
packs and some antiinflammatory or a painkiller should be fine. you will feel some relief in a few days. You should not generally get hurt while practicing and so you need to recheck the method you are using and take advice from an expert or physiotherapist before taking up any new activity. Do not massage
the sore area but give it adequate rest.