vaccine site in her arm today its sort pf pink to red like a circle about 1/3 quarter in diameter/a little bit hard/tender and warm to touch/going on hot. She also has some swelling but not bad; vaccine site in her arm today its sort pf pink to red like a circle about 1/3 quarter in diameter/a little bit hard/tender and warm to touch/going on hot. She also has some swelling but not bad; vaccine site in her arm today its sort pf pink to red like a circle about 1/3 quarter in diameter/a little bit hard/tender and warm to touch/going on hot. She also has some swelling but not bad; vaccine site in her arm today its sort pf pink to red like a circle about 1/3 quarter in diameter/a little bit hard/tender and warm to touch/going on hot. She also has some swelling but not bad; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) from medical information team, Program ID. The reporter is the patient.  A 71-year-old female patient received bnt162b2 omi xbb.1.5 (COMIRNATY (2023-2024 FORMULA)), as dose 1, single (Batch/Lot number: unknown), in arm for covid-19 immunisation. The patient's relevant medical history and concomitant medications were not reported. Vaccination history included: Covid 19 vaccine (Primary Immunization series completed., This was a Pfizer Covid booster she doesn't remember having this reaction before on previous doses.), for Covid-19 Immunization.  The following information was reported: VACCINATION SITE WARMTH (non-serious), outcome "recovering", VACCINATION SITE PAIN (non-serious), VACCINATION SITE SWELLING (non-serious), VACCINATION SITE ERYTHEMA (non-serious), outcome "unknown" and all described as "vaccine site in her arm today its sort pf pink to red like a circle about 1/3 quarter in diameter/a little bit hard/tender and warm to touch/going on hot. She also has some swelling but not bad".  Additional information: The reporter was a consumer calling regarding Pfizer COVID-19 vaccine and would like to inquire about side effects since she mentioned that at the vaccine site in her arm today its sort of pink to red like a circle about 1/3 quarter in diameter. And asked what hot injection site for Pfizer means. Caller stated it was larger than a quarter. It was one and 3 quarter inches in diameter. It was not terribly hard, but a little bit hard. It was not painful and she could move her arm. It was tender and warm to touch, warm going on hot. She also has some swelling but not bad. The warmth is better now than it was this morning. Caller stated the [Library name withheld] references "COVID Arm" that was a "harmless delayed hypersensitivity reaction occurring approximately a week after admin of the Novel Sars-CoV 2 mRNA vaccine that appears as a red warm pruritic indurated or swollen area in the vicinity of the vaccine site." Caller stated she has no itching but there was a little bit of hardening of the tissue but not severe. What did they say about the swelling? She said this was day two for her. This was a Pfizer COVID booster she doesn't remember having this reaction before on previous doses. She might have had some of the coloring of it and some pain for a booster or two but doesn't remember the warmth part of it.  The information on the batch/lot number for bnt162b2 omi xbb.1.5 has been requested and will be submitted if and when received.