I was worried that my OS and PA would freak out when they saw the knee - especially after I showed them the before and after pictures, but they were pretty calm and said I was having serious delayed contact dermatitis reaction to the tape on the knee. The OS, however, was confused as to why the ER prescribed Cephalexin instead of topical steroid. Anyways, he said since I started the antibiotic, I should probably finish, but he strongly felt I didn't need it and by the end of the appointment he seemed to waiver on whether I should continue taking the antibiotic. (I haven't taken any more doses, yet - it seems to wreak havoc on the GI tract)