His arm swelled up; His elbow has a baseball size pocket of swelling/6 inches below that elbow area he developed a very large, big bulge; swelling in the hand and hot to the touch; swelling in the hand and hot to the touch/The left arm is very feverish; hot; The left arm is very feverish; hot; red; left armpit the nodes there are swollen; This is a spontaneous report received from a contactable consumer (patient). A male patient of unspecified age (Age: 74; Unit: Unspecified) received first dose of bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, formulation: Solution for injection and batch no: not reported/lot number: not reported) via an unspecified route of administration, in left arm on 24Feb2021 at 11:00 as single dose for COVID-19 immunization. The patients medical history and concomitant medications were not reported. Caller stated that he received the first dose of the pfizer covid 19 vaccine yesterday 24Feb2021. Caller stated that five minutes after his arm swelled up and his elbow has a baseball size pocket of swelling and swelling in the hand and hot to the touch/The left arm was very feverish; hot swelling in the hand and hot to the touch Vitals were normal. Caller wanted to know what he could do about the swelling. Caller stated that he used benadryl, ice and epsom salt. This consumer was administered their first dose of Pfizer COVID-19 Vaccine on 24Feb2021 at 11:00 to the left arm. Within 5 minutes of being administered that dose his entire left arm swelled up including his arm pit, elbow and hand. Under the left armpit the nodes there are swollen, and he was wondering if it would be ok to just take Tylenol or Ibuprofen for that discomfort or will those products interfere with the workings of the Pfizer COVID-19 Vaccine. They went to the observation nurse who took his vitals which were ok, he did not have any problems or bleeding; but the swelling of his entire arm was still present. Consumer wanted to know what they can do to reduce the swelling. They tried ice, and even Epsom salt with warm water thinking it would help it. The left arm is very feverish; hot; red; about twice the size it was normally; his elbow area produced a swelling the size of a baseball at least and then a pocket. The swelling of the elbow area was kind of soft so they said oh that was ok; but at same time about 6 inches below that elbow area he developed a very large, big bulge. That bulge later in the day became hard; but consumer reported the bulge only became hard when his was arm bent; otherwise, the bulge was soft when arm was extended. Because he had such a quick reaction to the Pfizer COVID-19 Vaccine; it blew the socks off all the nurses there, they could not believe how fast and how large the swelling area was; they had never seen anything quite so large or occur so quick before; they wanted to know if he should still get the second dose of the Pfizer COVID-19 Vaccine relative to this event. Patient underwent lab test and procedure which included Vitals with normal results. Outcome of the events his arm swelled up and His elbow has a baseball size pocket of swelling/6 inches below that elbow area he developed a very large, big bulge was not recovered and other events was unknown.   No follow up attempts are possible; Information about Lot and batch number could not be obtained.