Shot might have been given incorrectly and that it wasn't given deep enough that it should be/that the shot should have been intramuscular; Did not gave the shot deep enough into the muscle; It was swollen, very swollen, it was swollen/ and my armpit was swollen as well; and red; It was painful; infection; This is a spontaneous report from a contactable consumer. This 53-year-old female consumer reported. A 53-year-old female patient received first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, formulation: solution for injection, batch/lot number: FF8841) via intramuscularly in left arm on 03Oct2021 (at the age of 53 years old) as DOSE 1, SINGLE for COVID-19 immunisation. The patient medical history included High Blood Pressure and she was on medication for high blood sugar, this was a slight border line, it was below, its below 6 or whatever. The concomitant medication included lisinopril, metformin and hydrochlorothiazide (HCT) for an unknown indication from an unknown date.  Historical vaccine included flu shot on an unknown date for an unknown indication. On 03Oct2021 (same day of vaccination), the patient experienced Shot might have been given incorrectly and that it wasn't given deep enough that it should be/that the shot should have been intramuscular; Did not gave the shot deep enough into the muscle, it was swollen, very swollen, it was swollen/ and my armpit was swollen as well, and red, It was painful, infection. Further explained that she had an adverse reaction after got her first shot of COVID, Covid shot. So, she thought it was normal but when she spoke to the doctor friend of her, that was when he said, no, it wasn't but assured checking that and what he said was, the shot might have been given incorrectly and that it wasn't given deep enough that it should be, like intramuscular but it wasn't deep enough. So, he advised that she call the clinic where she got it because she had the second one this weekend and she was kind of concerned about it but because she had the reactions. It was stated that she believed it was on Sunday, it might have been like, she thought it was 03Oct2021, two weeks ago." It was reported that she was not currently experiencing it, after she took the shot, it was swollen, very swollen, it was swollen and red and my armpit was swollen as well, she think 'it was called' something and then, it was painful. So, that was it, that was the reaction she had. Her doctor said it was not a reaction to the vaccine and told her that the person didn't push the needle in far enough, he said it was an infection but not a reaction. It was stated her arm was swollen for a week. She didn't take any treatment because she thought it wasn't 'serious' one, you know, that could have been just normal reaction. It was also reported that she was no longer, she don't have any, not experiencing any of the symptoms again, it went away after got the shot, eight days after but then her doctor friend said, it shouldn't have taken that long and that it was given incorrectly but the pharmacy said it wasn't, that was part of the reaction that one can get from the Pfizer vaccine. So, that was the reason she was calling." It was stated that she never taken any, what it was called flu shot before but of course she did get her, she got some vaccine when she was younger. Within four weeks of taking the shot, no, she didn't take any shot before the COVID shot." She also reported that, "So, she wanted to know, was it okay for me to get a second one or not". At the time of this report the outcome of the events were unknown.  Follow-up attempts are completed. No further information is expected.