Still have this lumps on my arms; Lump remaining in my arm; Have been feeling tired; I have been feeling fatigued; Developed a bump on my arm/it looks like a mosquito bite but it is not, it is on my arm and it does not go away and it is like a round, a little round bump; looks like a mosquito bite; Just one bump developed; Had itching like the first day, itching on my arm; This is a spontaneous report from a contactable consumer. An 81-year-old patient of an unspecified gender received third dose (booster) of BNT162B2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE, Formulation: Solution for injection, Batch/Lot number was not reported, NDC/ UPC number and expiry date: unknown) via an unspecified route of administration, administered in left arm on 28Sep2021 (age at vaccination: 81-year-old) as DOSE 3 (BOOSTER), SINGLE for COVID-19 immunization. Medical history and concomitant medication were not reported. Previously the patient had received first and second doses of BNT162B2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE, Formulation: Solution for injection, Batch/Lot number was not reported) via an unspecified route of administration on an unspecified date as DOSE 1, SINGLE and DOSE 2, SINGLE for COVID-19 immunization. On 29Sep2021 the patient have been feeling tired, I have been feeling fatigued, developed a bump on my arm/it looks like a mosquito bite but it is not, it is on my arm and it does not go away and it is like a round, a little round bump, looks like a mosquito bite, just one bump developed, had itching like the first day, itching on my arm, still have this lumps on my arms; lump remaining in my arm. It was reported that consumer stated, "Well I got the booster shot for Pfizer (Unspecified vaccine) like 10 days ago and I have been feeling tired but I've read that's kind of a normal side effect. So I have been feeling fatigued. But the thing I am kind of wondering about is the day after I had the injection, I developed a bump on my arm, it looks like a mosquito bite and it stayed that way now it's been 10 days and it just stayed that way, it have not got smaller, it have not got bigger it just stayed like looks like a mosquito bite. But it is not, it's just one bump developed the day after I had the booster. So, I was a little concern about that, I didn't know whether to go to urgent care and see if they have something to put on it or if they can drain it, I don't know, is this common", consumer stated "I don't have the vaccination card for that, it was a booster." Therapeutic measures were taken as a result of developed a bump on my arm/it looks like a mosquito bite, but it is not, it is on my arm and it does not go away and it is like a round, a little round bump (peripheral swelling), looks like a mosquito bite (arthropod bite). The outcome of had itching like the first day, itching on my arm was recovered; developed a bump on my arm/it looks like a mosquito bite but it is not, it is on my arm and it does not go away and it is like a round, a little round bump, looks like a mosquito bite, still have this lumps on my arms; lump remaining in my arm was not recovered; have been feeling tired, I have been feeling fatigued, just one bump developed was unknown.  The lot number for BNT162B2 was not provided and will be requested during follow-up.