My son is a type 1 Diabetic, he developed a hangnail on Thursday it really did not start bothering him until Sunday, by 10:00 pm he didnt feel well and the finger was very red and soar. Gave him some acetaminophen, he got up a few times not able to sleep, so finally at 3:00 am we checked on him and his finger looked scary, very swellen red and kinda blue, went to ER gave him Cephalexin 500 mg