she had the swelling in her left armpit; HCP said this was soft tissue swelling; she was unable to move her arm up and couldn't move it because it was so completely swollen; a lot of soft tissue swelling in her left breast and it is very painful.; a lot of soft tissue swelling in her left breast and it is very painful.; This is a spontaneous report from a contactable Nurse (patient). A 39-year-old female patient received BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, Formulation: Solution for injection, Lot number was not reported) via an unspecified route of administration, administered in Arm Left on 24Aug2021 08:00 (at the age of 39 years old) as dose 2, single for COVID-19 immunisation. Medical history included pneumonia from an unknown date and unknown if ongoing (she had pneumonia twice in 3 years), abscess from an unknown date and unknown if ongoing (she had had an abscess before in a lymph node when she was much younger and that had been cut open). There were no concomitant medications. Patient's historical vaccine included first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, Formulation: Solution for injection, Batch/Lot number was not reported) via an unspecified route of administration on 03Aug2021 08:00 (at the age of 39 years old) as dose 1, single for COVID-19 immunisation and experienced had gelatinous clear and bloody stools every single day for about 5-6 days, was a little achy in her arm, had never had diarrhea in her 39 years of life; Stated she was still eating and drinking and feeling fine and had stomach pains and that was the only thing coming out of her body. Historical vaccine also included pneumonia vaccine on 2017 for immunisation and experienced achy in her arm; flu vaccine on an unspecified date for immunisation and experienced arm soreness with the flu vaccine. Additional Vaccines Administered on Same Date of the Pfizer Suspect was none. The patient experienced she had the swelling in her left armpit, health care professional said this was soft tissue swelling. She received 2nd dose of the vaccine and had reactions to after the 2nd dose that she got on Tuesday 24Aug2021, she had armpit swelling and her lymph nodes was super swollen and a lot of soft tissue swelling in her left breast and it was very painful (on 24Aug2021). Other vaccines she has had in order to prevent the flu or pneumonia but it was not a big deal. Stated after the 2nd dose of the Pfizer COVID Vaccine, she had the swelling in her left armpit and had gotten the 2nd dose at 08:00 and by Tuesday night (24Aug2021), she realized she was unable to move her arm up and couldn't move it because it was so completely swollen and she went to work and asked the health care professional she worked with to take a look at it to make sure she was not missing anything because she had had an abscess before in a lymph node when she was much younger and that had been cut open; stated the health care professional said this was soft tissue swelling and to contact her primary care physician. She went today (unspecified) to see her primary care physician and he agreed it was a reaction to the Pfizer COVID vaccine and it was a known reaction to have happen and he put her on steroids over the weekend and said to touch base on Monday or Tuesday and she started taking the steroid Prednisone this morning and it was 20mg and she had to take one tablet twice per day for 5 days. She had arm soreness last year and had pneumonia but did not received the pneumonia shot then and in 2017 she had pneumonia so bad that she was in the hospital for two weeks and when she recovered at 100 percent the health care professional recommended she get the pneumonia vaccine so she got the pneumonia vaccine at that point in 2017 or 2018 and has no lots, expiry dates or NDC or name of the vaccine to provided. Adverse event resulted in physician office visit. Therapeutic measures were taken as a result of she had the swelling in her left armpit, soft tissue swelling. Outcome of the events were unknown.  Information on the Lot/Batch number has been requested.