Large itchy blister under arm where vaccine was givenapproximately 10-12 days after 1st vaccine as well as hive likehard bumps around elbow of same arm, as well as hive likebump near ear of right side; Large itchy blister under arm where vaccine was givenapproximately 10-12 days after 1st vaccine as well as hive likehard bumps around elbow of same arm, as well as hive likebump near ear of right side; I had a big blister; This is a spontaneous report received from a contactable consumer (patient). A 77-year-old non-pregnant female patient received BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, Formulation:Solution for injection, Lot number was not reported), via an unspecified route of administration in the right arm on 09Feb2021 (at the age of 77-years-old) as first dose, single dose for COVID-19 immunization. The patient's medical history included asthma, minor arthritis, acid reflux, high cholesterol, penicilin allergy, bug bites allergy and mosquito bites allergy. Concomitant medications included Atorvastatin calcium (STATIN) 5 mg. Multi-Vitamin and Folic Acid pill (received within 2 weeks of vaccination). The patient did not receive any other vaccines within 4 weeks prior to the COVID vaccine. The patient was not diagnosed with  COVID-19 prior to vaccination nor had been tested for COVID-19 since the vaccination. The patient experienced large itchy blister under arm where vaccine was given approximately 10-12 days after 1st vaccine as well as hive like hard bumps around elbow of same arm, as well as hive like bump near ear of right side. Followed by very itchy bumps on left arm at elbow site.The patient was given treatment for not totally yet, but itching, redness and swelling and was put on antibiotics, then prednisone, then Zyrtec. She had both doses. She stated that "after first dose I had a worse reaction (I had a big blister). It appeared 11 days after the shot; didn't happen right away. After the 2nd shot it affected 2 elbows and the neck but no blister (same as the first but the first had the giant blister). I've gone to 2 physicians who didn't know what it was or if it may be an allergic reaction no one had identified it. I thought it was bug bites (I'm allergic to mosquito bites and allergic to insect bites). It was so inflamed for a month I was going crazy. The first doctor gave me: cortisone, steroids, and an anti-inflammatory. 2nd time (after the 2nd dose) another doctor put me on prednisone and Zyrtec. The 3rd person I spoke with thinks it's covid arm. No one can tell me what it is. I saw some photos of what people had. Although I've had it in 3 different spots, under the arm, and elbow, the hand I got the shot on, under my ear (lump) and left elbow. It's on 2 arms, and part of the neck. I've been to a dermatologist and my internal doctor. Thinks it's the reaction to the covid vaccine. It on the right side, neck and right arm (not where the injection site was) giant blister on right arm between elbow and wrist at least 6 inches long and 3 inches wide. On the left side: left elbow and above the elbow. The big blister under my arm where I had my shot, neck and two elbows. The first reaction it happened 10-11 days after the first shot, after the 2nd shot: it came back, but not as a blister (soon after the 2nd shot). No body knows what it is. The problem with the reaction was when it's so inflamed. It feels like I got mosquito bite (like when I get a reaction) I didn't sleep the whole night. She (the doctor) said, I can't tell if it's a bug bite because it's so inflamed. The doctors don't know. I got no results with 2 doctors. They didn't know what to tell me, Maybe an allergist? My asthma has been worse. It's horrible to have this. Thinking I had bed bugs, it's been driving me crazy for a month. I was going to get a new bed. I have pictures; it's on my phone from the first dose. My doctor saw this and they didn't know what it was on my elbows and neck. contact caller if needed". The patient further reported that , "I have been to two doctors for some itchy things that have been happening and I did my own research and I am wondering if it could be either reaction, allergic reaction to the COVID Vaccine. Are you qualified to answer question if I give you symptoms? Well, I just want to tell you it's not just some itchiness, at first sight I thought I had insect bites. It happened in two locations under the right side of my neck which is like a big red blotch that was very itchy at the same time on my right arm where I had the shot there was a blister on the inside of my arm that was probably 6 or 7 inches long and may be 4 inches wide, and then at my elbow, it felt like I had mosquito bite that itched so much my elbow turn red and then my other arm at the elbow turn red and itchy. I went to the dermatologist, they didn't know what the heck it was, so what they did was they gave me antibiotics (captured as Unspecified medication) and it subsided for a while but it did not go away and I was using cortisone cream, steroid cream. And then after the second shot, now this reaction, the first time was not right after the vaccination it was probably close to 2 weeks after the vaccination and I didn't know what it was and nobody knew what it was. So I was thinking, I had bugs in my house. I was getting all kind of things, I called exterminator. I did not know what to do, so the second time it happen it was not that bad, but then I went to the Doctor and she said well it may be a COVID reaction but I do not understand why it's happening in these isolated spots on your right and your left elbow and one side of my face and my neck, so it was isolated, it was not a rash, it was like if you got an allergic reaction to mosquito bite but so itchy and red and inflamed, it was not funny. So nobody knew what it was, so the second doctor than gave me antihistamine and am I now taking prednisone so I am hoping that what I am doing is the right thing because nobody seems to know what it is. Let me just tell you that while I was waiting for you to answer I filled out the form but I only fill it that because I was confused at the question. I filled it out noting the reaction to the first vaccine but I did not see a spot where it say second vaccine so I just put that in section where you explain certain things, but I would rather get some information for you to make sure that I am doing the right thing what I am taking (hence no further probing was done." Outcome of the events was resolving.   No follow-up attempts are needed; information about lot/batch number cannot be obtained.