My mom s leg is red, sore, and quite puffy, from the knee on down. She was diagnosed with cellulitis and has been on an antibiotic since June 13th. First 7 days worth, seemed to be better but within 1 day of being done with the antibiotic, it started to come back. Went on for 5 more days, but didn t get better, now only worse so they have her on a different one. Could it be something else?