My sister has a huge boil like thing under her chin. It is about the size of her chin so it looks like a double chin only it is red and warm, and hard. She has tried squeezing it but only gets watery stuff mixed with a little blood. She went to the hospital thinking it was a spider bite and they did lab work. They said the only remarkable things were her blood pressure was really high and her blood suger was over 600. They wanted to keep her in the hospital but she refused. They gave her an antibiotic but I just got home from vacation but she said it was 4 days ago that this started and it is still warm to the touch and red. Should I take her back to the hospital and make her stay or is all they can do for her is the antibiotic anyway?