What should I do about a white spot appearing on my gum after flap/bone grafting surgery? 3 days post. (photo)

I have severe gum disease. I had flap/bone grafting surgery. It has been exactly 3 days since i had the surgery and yesterday, i noticed 1 white spot on my gum. It is a little swollen and sore but nothing painful. The rest of my gum seems normal. I am taking ibuprofen, and I was told I could take amoxicillin if the swelling didn't stop after 3 days. Should i take the antibiotic or could i wait and see what happens? I don't want to take an antibiotic if it is not necessary.