I have a keloid on my belly button when I had a gallbladder surgery. For the last 2 days, it's been very painful and reddish. When I went to my doctor, she said it might be infected because there is something hard under it. She gave me antibiotics for 10 days and she said if the antibiotic is not gonna work, it might have to be open up and drain it. Can you tell me how they will open it up?