Thanks for writing in.
I read your problem,i would like to suggest you that generally tongue biopsy
is very pain full and it take 20-30 day for healing,so dentist
gives medicines after tongue biopsy.
Painkillers are included in that prescription so do not get worried.
If after medication also pain and bleeding persist,it is not normal,you need to visit your dentist again and get the thorough examination done.