cellulitis; Bacterial skin infection; right arm where I got the injection turning all red and swollen; arm swelling; bursitis; Muscle pain; joint pain in elbow; the bruise have been flamed; Feeling hot; This is a spontaneous report from a contactable consumer (patient). A 75-year-old female patient received BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, lot number: EN6207) at the age of 75-years-old, via an unspecified route of administration in right arm on 13Mar2021 at single dose for COVID-19 immunization. Medical history included diabetic type 2 for probably 13-14 years, sleep apnea for 20 years (2001), arthritis in 2005 (probably 12-14 years), and blood pressure abnormal (reported as blood pressure). Concomitant medications included metformin, sertraline, alprazolam, sitagliptin (JANUVIA), oxybutynin, insulin glargine (LANTUS), lisinopril for blood pressure abnormal (reported as blood pressure), and cortisone for arthritis. The patient received the vaccine on 13Mar2021 in the afternoon and within 24 to 30 hours, the next day (14Mar2021), her right arm, where the vaccine was administered turned all red and swollen and her elbow also hurt. She went to the emergency room because she felt it was a reaction to the vaccine. They told her that it was a bacterial skin infection, an adverse effect of an initial encounter to the vaccine, arm swelling and bursitis caused by that, muscle pain and join pain in elbow and then she guessed it was like cellulitis. They gave her ROCEPHIN at the emergency room and then a couple days later, it wasn't getting any better and it was all the way down to her wrist. She went to immediate care center and received an antibiotic. She was also given 2 more prescription of antibiotics and told that it had to be administered with the antibiotics to get rid of the reactions. It has finally pretty much cleared up with the antibiotics if they hadn't put her in an immediate care and put her on intravenous medications. They were really concerned because it was going to get into sepsis or something. At first, the patient thought that it was just inflamed, then it was skin infection and then adverse effect from the initial encounter of the vaccine. She had been on the antibiotics for 10 days when it finally cleared, but the elbow was still sore and it hurts a lot, but the fluid was drained by an orthopedic doctor. She was given 2 different types of antibiotics plus a shot into her buttocks. It's a little sore because she was informed that "the bruise have been flamed" on Mar2021. When she went to emergency, first they give her 1 gm ROCEPHIN and then switched antibiotic to DURICEF and to BACTRIM DS, and advised to continue monitoring and if swelling and redness was progressive or worse, then go to emergency room again. She went to emergency room on 16Mar2021, the medicine given was doxycycline and then she was seen by an orthopedic physician today where the fluid was drained from her elbow but swelling and redness was progressively getting worst and she was feeling hot on Mar2021. So, she went to the immediate care. Overall, consistent to cellulitis of right upper arm strongly includes to go to the ER but the patient had something else and had to go right then. And then, she was given 1 gm ROCEPHIN and then switched to DURACEF and BACTRIM. She came back to the ER on the same day. It was kind of 2 things, like the redness and skin infection which currently was cellulitis. Doxycycline was what they told her to get, that's what they gave her at the emergency room, doxycycline hyclate. And then said to follow-up with her primary care which she did and that was on 17Mar2021. She looked at it and then they told her to see an orthopedic surgeon and she saw him on the 18Mar2021. They just thought that the antibiotics, that's why he gave her 2 different prescriptions plus the shot in the buttocks because he said if this will not be cured with the antibiotics, she'll end up in a hospital. And then it was raft and it took her 10 days to recover. And he marked little black dots to show where wasn't and if it goes beyond that then call us because it was spreading. The outcome of the events bruise and feeling hot was unknown, not recovered for joint pain, and recovered on 24Mar2021 for all other events. The events required emergency room visit/ physician office visit.