Her armpit, in the arm where she got her booster vaccine, was swollen/armpit lump; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 47-year-old female patient received BNT162b2 (BNT162B2), on 07May2022 as dose 3 (booster), single (Lot number: FM0173) at the age of 47 years, in left arm for covid-19 immunisation. The patient's relevant medical history included: "Hyperthyroidism", start date: Oct2021 (ongoing), notes: Hyperthyroidism, Caller states she is not taking any medications for this condition. There were no concomitant medications. Vaccination history included: BNT162b2 (Dose 1, Lot Number: EW0153, Route, Anatomical Location: left arm), administration date: 15Apr2021, when the patient was 46-year-old, for Covid-19 immunization; BNT162b2 (Dose 2, Lot Number: EW0169, Route, Anatomical Location: left arm), administration date: 06May2021, when the patient was 46-year-old, for COVID-19 immunization. The following information was reported: AXILLARY MASS (non-serious) with onset 09May2022, outcome "recovering", described as "Her armpit, in the arm where she got her booster vaccine, was swollen/armpit lump".  Additional information: she got her booster on Saturday. Caller reports that yesterday, her armpit, in the arm where she got her booster vaccine, was swollen. Caller confirms as this was her first booster. Vaccine was not Administered at Military Facility. No prior Vaccinations (within 4 weeks) or any other vaccinations within four weeks prior to the first administration date of the suspect vaccine(s) was reported. The caller is a 47-year-old female patient who previously called to report a previously called to report an "armpit lump" that appeared on Monday on the same arm where she received the on Monday on the same arm where she received the vaccine, after having received a booster shot on Saturday of the COVID vaccine for the Saturday booster shot of Pfizer's COVID vaccine. She mentions that "the little ball she does not know whether to consult with her primary care physician or what to do about it. to do about it. She provided the report number of ALKY87UD. She mentions that she had not spoken to anyone from Pfizer Medical Information. She also mentions that when the first vaccine was given to her she was given information about mild reactions, which included this lump as a secondary reaction, and asked if there would be a as a secondary reaction, and she asked if there would be any type of I additional information. During the call, the caller mentioned that her first dose was on 15Apr and the second on 06May, and that in October she started 06May, and that in October she started to feel sick so she went to see her doctor who diagnosed her with She went to see her doctor who diagnosed her with hyperthyroidism, for which she received treatment for a month and a half (6 weeks) and that she has and has returned to normal values since then. Without However, she knows of two other people who had similar thyroid problems after receiving similar thyroid problems after receiving the vaccine. She mentions that she finds it curious that it is transient, that she knows others with a similar other people with a similar problem and that she presented with no family history of hyperthyroidism. The caller asked if there was any information about thyroid effects after receiving the vaccine. The caller asks if she could receive the second booster of the vaccine after the reaction she had with the first booster. AE e-transmitted. Caller previously called and was given Reportum Number of ALKY87UD.