I notice a large red patch covering my left upper arm at the injection site , midway between my elbow and shoulder, about 4 " square.; It is hot to the touch, smooth and red; It is hot to the touch, smooth and red; That area seems to be swollen also.; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 69 year-old female patient (not pregnant) received bnt162b2 (BNT162B2), administered in arm left, administration date 01Oct2021 14:30 (Lot number: FF8839) at the age of 69 years as dose 3 (booster), single for covid-19 immunisation. Relevant medical history included: "Sjogrens" (unspecified if ongoing); "hypothyroidism" (unspecified if ongoing); "arthritis" (unspecified if ongoing); "known allergies:some sulfa drugs" (unspecified if ongoing). Concomitant medication(s) included: LEVOTHYROXINE; SIMVASTATIN; OMEPRAZOLE; IBUPROFEN; VITAMIN B [VITAMIN B COMPLEX]; VITAMIN C [ASCORBIC ACID]; VITAMIN E [TOCOPHEROL]; BIOTIN; MAGNESIUM; ZINC; VITAMIN D [VITAMIN D NOS]. Past drug history included: Augmentin, reaction(s): "Known allergies: Augmentin"; Demerol, reaction(s): "known allergies:Demerol". Vaccination history included: Bnt162b2 (Prev dose Product: COVID 19, Prev dose Brand: Pfizer, Prev dose lot number: EN9266, Prev dose Administration time: 04:30 pm, Prev dose Dose number: 2, Prev dose Vaccine location: Left arm , A few days after the second dose, I got what I thought was a cold sore starting on my chin. It got bigger each day until the 4th day, it was about 3/8" in diameter, and throbbing, stinging pain. I used Melaleuca oil on it, and it gradually subsided and went away, but left a smallpox like scar on my chin.), administration date: 01Mar2020, for covid-19 immunization, reaction(s): "cold sore"; Bnt162b2 (Prev dose Product: COVID 19, Prev dose Brand: Pfizer, Prev dose lot number: EN5318, Prev dose Administration time: 04:30 pm, Prev dose Dose number: 1, Prev dose Vaccine location: Left arm), administration date: 08Feb2021, when the patient was 68 years old, for covid-19 immunization; Bnt162b2 (A few days after the second dose, I got what I thought was a cold sore starting on my chin. It got bigger each day until the 4th day, it was about 3/8" in diameter, and throbbing, stinging pain. I used Melaleuca oil on it, and it gradually subsided and went away, but left a smallpox like scar on my chin.), for covid-19 immunization, reaction(s): "pain", "smallpox like scar". The following information was reported: VACCINATION SITE ERYTHEMA (non-serious) with onset 03Oct2021 17:00, outcome "not recovered", described as "I notice a large red patch covering my left upper arm at the injection site , midway between my elbow and shoulder, about 4 " square."; FEELING HOT (non-serious), ERYTHEMA (non-serious) all with onset 03Oct2021 17:00, outcome "not recovered" and all described as "It is hot to the touch, smooth and red"; SWELLING (non-serious) with onset 03Oct2021 17:00, outcome "not recovered", described as "That area seems to be swollen also.". Therapeutic measures were not taken as a result of vaccination site erythema, feeling hot, erythema, swelling.No other vaccine was administered in four weeks. Patient did not had covid prior vaccination. Covid was not tested post vaccination.  No follow-up attempts are possible. No further information is expected.