I Had 7 Teeth Extracted About 5 Weeks Ago, It

I had 7 teeth extracted about 5 weeks ago, it has been a long process in healing . I had developed a blister like bubble on my gums with a white patch on top. The dentist prescribed me amoxicillin 500 every 8 hours I have been on the antibiotic for 4 days now and I still have the bubbles with the white patch on it, the soreness has decreased since then. any recommendations