swelling under the same arm; swelling hurt, was warm/It was warm; tender to touch/sensitive to pressure hand; This was very scary; booster; cold; sneezing; runny nose; stuffy nose; large swollen area under my arm (pit); pain; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) for a Pfizer sponsored program. The reporter is the patient.  A 71 year-old patient received bnt162b2 (BNT162B2), administered in arm right, administration date 02Oct2021 (Lot number: FF2593) as dose 3 (booster), single for covid-19 immunisation. The patient had no relevant medical history. There were no concomitant medications. Vaccination history included: Bnt162b2 (Dose 1, Single, Batch/Lot number: EN6201 , Expiry date: 30Jun2021, Administration Time (24hr): 12-1 PM, Anatomical Site of injection: Right Arm, Verbatim: Other than feeling less than well for a day and a sore arm, I did fine with these), administration date: 22Feb2021, for COVID-19 immunization, reaction(s): "feeling less than well for a day", "Sore arm"; Bnt162b2 (Dose 2, Single, Batch/Lot number: EP7534, Expiry date: 31Jul2021, Administration Time (24hr): 10-12 noon, Anatomical Site of injection: Right Arm, Verbatim: Other than feeling less than well for a day and a sore arm, I did fine with these), administration date: 18Mar2021, for COVID-19 immunization, reaction(s): "Sore arm", "feeling less than well for a day". The following information was reported: IMMUNISATION (non-serious) with onset 02Oct2021, outcome "unknown", described as "booster"; NASOPHARYNGITIS (non-serious) with onset Oct2021, outcome "recovered" (2021), described as "cold"; SNEEZING (non-serious) with onset Oct2021, outcome "recovered" (2021), described as "sneezing"; RHINORRHOEA (non-serious) with onset Oct2021, outcome "recovered" (2021), described as "runny nose"; NASAL CONGESTION (non-serious) with onset Oct2021, outcome "recovered" (2021), described as "stuffy nose"; SWELLING (non-serious) with onset 04Oct2021, outcome "recovered" (08Oct2021), described as "swelling under the same arm"; FEELING HOT (non-serious) with onset 04Oct2021, outcome "recovered" (2021), described as "swelling hurt, was warm/It was warm"; TENDERNESS (non-serious) with onset 04Oct2021, outcome "recovered" (2021), described as "tender to touch/sensitive to pressure hand"; FEELING ABNORMAL (non-serious) with onset 04Oct2021, outcome "unknown", described as "This was very scary"; LYMPHADENOPATHY (non-serious) with onset 2021, outcome "recovered" (2021), described as "large swollen area under my arm (pit)"; PAIN (non-serious) with onset 2021, outcome "recovered" (2021), described as "pain". The events "swelling under the same arm", "swelling hurt, was warm/it was warm" and "tender to touch/sensitive to pressure hand" were evaluated at the physician office visit. Therapeutic measures were taken as a result of nasopharyngitis, sneezing, rhinorrhoea, nasal congestion, swelling, feeling hot, tenderness, feeling abnormal, lymphadenopathy, pain. Additional Information: Patient had no prior vaccination within 4 weeks and no prior medical history for any illness. Patient reported that, on 02Oct2021, she received your COVID booster. She felt like she was getting a cold with sneezing, runny nose and stuffy nose. This lasted five days. The worst thing however was on Thu 04Oct2021. I had swelling under the same arm I received the booster. This swelling hurt, was warm and tender to the touch. Her Primary Care doctor said to take Tylenol and apply warm compresses to under arm (use warm moist compressor mist). As of this morning on 08Oct2021, the swelling was almost gone. Upon follow up(on 06Dec2021) patient reported she had a large swollen area under her arm (pit). It was warm, puffy, sensitive to pressure hand and swollen. After 4 days the swelling, pain and heat were gone.  No follow-up attempts are possible. No further information is expected.