Slight swelling; Itching; sick with normal side effects; left arm at the site of the injection looks like a huge red spot; It's hard and hot and black and blue in the middle; Arm is size of a roll of paper towels; feeling hot and hard to the touch; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 70 year-old female patient received bnt162b2 (BNT162B2), administered in arm left, administration date 27Sep2021 (Lot number: 301308A) at the age of 70 years as dose 3 (booster), single for covid-19 immunisation. Relevant medical history included: "Overweight" (unspecified if ongoing). The patient's concomitant medications were not reported. Vaccination history included: Bnt162b2 (DOSE 1,SINGLE, lot: EM9809, Route of administration: upper left arm), administration date: 17Feb2021, for COVID-19 immunization, reaction(s): "sick with normal side effects"; Bnt162b2 (DOSE 2,SINGLE, lot: EN6200, Route of administration: Upper left arm), administration date: 10Mar2021, for COVID-19 immunization, reaction(s): "sick with normal side effects". The following information was reported: ILLNESS (non-serious) with onset Sep2021, outcome "unknown", described as "sick with normal side effects"; VACCINATION SITE ERYTHEMA (non-serious) with onset Sep2021, outcome "unknown", described as "left arm at the site of the injection looks like a huge red spot"; SKIN DISORDER (non-serious) with onset Sep2021, outcome "unknown", described as "It's hard and hot and black and blue in the middle"; LIMB DISCOMFORT (non-serious) with onset Sep2021, outcome "unknown", described as "Arm is size of a roll of paper towels"; FEELING HOT (non-serious) with onset Sep2021, outcome "unknown", described as "feeling hot and hard to the touch"; SWELLING (non-serious) with onset 30Sep2021, outcome "not recovered", described as "Slight swelling"; PRURITUS (non-serious) with onset 30Sep2021, outcome "not recovered", described as "Itching".  Additional information: Her third dose of the Pfizer COvid-19 Vaccine on 27Sep2021. She has been sick with normal side effects that she had before with the initial vaccine series, but her left arm at the site of the injection looks like a huge red spot. It's hard and hot to touch and black and blue in the middle. She did not feel well enough to go out to the Emergency room. She has no doctor at this time due to retirement or leaving the practice. She wants to know if she is having a normal reaction or should she go to the emergency room. She knew Pfizer cannot give her medical advice. She was overweight, so she has large arms; but this one is the size of a roll of paper towels. It is feeling hot and hard to the touch. She wants to know if she is having a normal reaction or should she go to the emergency room. She knew Pfizer cannot give her medical advice, but maybe she can be told if anyone else has reported something like this. Her arm where she got the shot is huge, red, black and blue in the middle, it is hard and hot to the touch. She was overweight, so she has large arms; but this one is the size of a roll of paper towels. It is feeling hot and hard to the touch. Itching was persistent, the itching was happening now and was not happening. she received the third dose Pfizer Covid Vaccine because of her age and wouldn't say compromised immune system but the caller has medical issues and is overweight. Because these reactions are reported voluntarily.  Follow-up attempts are completed. No further information is expected.