Small red circle on left arm after booster dose; booster; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 81 year-old female patient received bnt162b2 (BNT162B2, solution for injection, Is Pfizer COVID vaccine a Pfizer product; Yes; Pfizer COVID vaccine manufacturer: Unspecified, NDC number of Pfizer COVID vaccine: Not Provided, Reason for no lot number: of Pfizer COVID vaccine: Complainant does not have the product with them at the time of call, Expiry Date of Pfizer COVID vaccine: Unknown) via an unspecified route of administration .administered in arm left, administration date 31Dec2021 (Batch/Lot number: unknown) at the age of 81 years as dose 3 (booster), single for covid-19 immunisation. Relevant medical history included: "minor food allergies" (unspecified if ongoing); "Minor food allergies" (unspecified if ongoing), notes: diagnosed 10 years ago. They have a special diet. There were no concomitant medications. Vaccination history included: Bnt162b2 (Dose 1, Lot and expiration are unknown.  It was injected in her left arm and sore arms From: 05Feb2021 To: Unspecified), administration date: 05Feb2021, when the patient was 80 years old, for covid 19 immunization, reaction(s): "sore arms"; Bnt162b2 (dose 2, Lot and expiration are unknown. Injected in Left arm., and sore arms From: 05Feb2021 To: Unspecified), administration date: 26Feb2021, when the patient was 80 years old, for covid 19 immunization, reaction(s): "sore arms". The following information was reported: IMMUNISATION  with onset 31Dec2021, outcome "unknown", described as "booster"; RASH MACULAR with onset 04Jan2022, outcome "recovered" (05Jan2022), described as "Small red circle on left arm after booster dose".  Additional information:  Received call from consumer regarding the Pfizer COVID Vaccine Booster.  She is calling on behalf of her husband, who is at the doctor's office. She talked to Pfizer before about another drug and Pfizer was very informative and upfront. She does not have a reference number for previous report.  They both got all of their booster doses at the same time 12 days ago.  While reporting for her husband, consumer mentioned that she had events to report.  This report is to document her experience. She did not see her primary care provider and did not wish to provide her name or contact details.  She received Pfizer COVID vaccine booster on 31Dec2021.  Lot and expiration are unknown.  It was injected in her left arm.     1st dose of Pfizer COVID vaccine given on 05Feb2021, Lot and expiration are unknown.  It was injected in her left arm.  The 2nd dose of the Pfizer COVID vaccine was 26Feb2021, Lot and expiration are unknown. Injected in Left arm. They decided to get the booster because there was so much to talk about.  Her husband is a younger man.  She is 81.  They thought maybe they were more at risk than they think they are and his sister had gotten it and thought they were being foolish to wait. They received it while in another state.  If they came back, there would have been a month wait. When they called to get it, they had it the next day. They both had sore arms with the first two. It was no biggie and it was in the left arm.  She said it kind of matters that they did everything together and she had no significant things. She did have a strange event.  She thinks it would be interesting for Pfizer to know.  She and her husband took the same shot at same place. He had a reaction and she just had one small event that was unusual.  Around the place the shot was, it was as if someone put red pencil and drew a perfect circle.  This was after booster dose.  It started 3 days after the booster dose and  it improved and faded away. She went to bed and saw it and the next morning it was gone. She had no problem at all with first two, other than her left arm was a little sore.  She has not had vaccinations since she was a kid.  She assumes everyone does have arm soreness.  She received all 3 doses on her left arm.  She takes no medication and has no other medical conditions.    Time the Vaccination Was Given was 13:00-14:00. Anatomical Location of Administration of Pfizer vaccine considered as suspect: Injected in left arm. Facility Type: Pharmacy. Vaccine Administered at a Facility; No. They both went for the first two doses. History of all previous immunization with the Pfizer vaccine considered as suspect (or patient age at first and subsequent immunizations if dates of birth or immunizations are not available. Vaccine Name: Pfizer COVID vaccine. Lot Number / Expiry Date: Unknown/Unknown. No. of Previous Doses:1; Date: 26Feb2021 Vaccine Name: Lot Number / Expiry Date: Unknown/Unknown, Route, Anatomical Location: Injected in left arm. No. of Previous Doses: 0. Date: 05Feb2021 Age at Immunization if date not available. Additional Vaccines Administered on Same Date of the Pfizer Suspect If applicable, list all vaccines administered on same date with the Pfizer vaccine considered as suspect: None. Adverse Event (AE) Details: Provide the time of onset of AE(s): Arm soreness - she had her stay for 15 minutes and it started right away on the same day.  Small red circle on left arm after booster dose.- She did not see it until she got undressed, unknown time.   It did not hurt and there was no soreness at that point and time. Additional Information Did any AE(s) require a visit to: Emergency Room;  No; Physician Office; No. Prior Vaccinations (within 4 weeks) If applicable, list any other vaccinations within four weeks prior to the first administration date of the suspect vaccine(s): none. AE(s) following prior vaccinations: None. Patient s Medical History (including any illness at time of vaccination); None or Unknown Provide other relevant medical history including but not limited to these conditions: diagnosed allergies, compromised immune status, respiratory illness, genetic/chromosomal abnormalities, endocrine abnormalities (including diabetes) and obesity Illness/AE: She has minor food allergies diagnosed 10 years ago. They have a special diet. Family Medical History Relevant to AE(s): none. Relevant Tests: None   She thinks the other medication that she called about, she received total information and decided not to take it, so she is on no medication and thinks she is fine.  She just felt Pfizer should know there are people that are experiencing side effects.  It is not mentioned and it may have changed their mind about it.  She thinks people should know there is a chance of reaction and her husband has really suffered. Investigation Assessment: No.   The lot number for bnt162b2 was not provided and will be requested during follow up.