an allergic reaction; really bad hives; itchiness; it got worse and worse and worse; rash and irritation; 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 27-year-old female patient received BNT162b2 (BNT162B2), on 29Mar2022 as dose 3 (booster), single (Lot number: FJ9943) at the age of 27 years for covid-19 immunisation. The patient had no relevant medical history. There were no concomitant medications. Vaccination history included: Covid-19 vaccine (Dose 1, Manufacturer unknown), for Covid-19 immunization; Covid-19 vaccine (Dose 2, Manufacturer unknown, Expiry date: EW0170), for Covid-19 immunization.  The following information was reported: HYPERSENSITIVITY (non-serious) with onset 01Apr2022, outcome "unknown", described as "an allergic reaction"; CONDITION AGGRAVATED (non-serious) with onset 01Apr2022, outcome "unknown", described as "it got worse and worse and worse"; PRURITUS (non-serious) with onset 01Apr2022, outcome "unknown", described as "itchiness"; URTICARIA (non-serious) with onset 01Apr2022, outcome "unknown", described as "really bad hives"; RASH (non-serious) with onset 2022, outcome "unknown", described as "rash and irritation". The events "rash and irritation", "really bad hives" and "itchiness" required emergency room visit. Therapeutic measures were taken as a result of rash, urticaria.  Additional information: It was reported that the patient had an allergic reaction, and she was taking high dosage of medication for the rash and irritation. It was reported that she was required by her employer to take the booster dose and she has an appointment with her PCP on 02May2022. she wanted to know if she can get a medical certificate to show her employer. The patient mention that she had reported her side effects. Advised caller that her doctor was the best person who can provide her with the medical certificate and informed caller that we have a document discussing how long side effects last which caller accepted. It was reported that she got her third dose of COVID (clarified as Pfizer COVID vaccine), the booster on 29Mar2022. So, three days later she started experiencing really bad hives and itchiness and she thought it was 'scheduled with the allergy or something else' but it got worse and worse and worse. But today, she went in and out urgent care nonstop from the rashes and the hives and itchiness. So, she just wanted to see reporting it, having it. She does not know what else to do? otherwise with her job that she got hired for we 'fired' the vaccine so she have seen doctor's doing there but she haven't been able to actually work due to the factor she really have a very bad rashes and stuff." Consumer stated, "Its EW0170 and she have another one it says FJ9943, the third one this was for the third vaccine. she believes its (EW0170) for the second dose she just has it." It was reported that It doesn't gave her me an expiration, it just says 02712, it doesn't have any expiration date. Reportedly for the hives she had this medication that they gave her. There are 4 different one. First one was called Hydroxyzine pamoate, this was one tablet and it was going to be 25mg." It was reported that she work in the medical field, she is a biller (hence captured as consumer or other non-health professional. Prior Vaccinations: Consumer stated, "No." It was queried by the patient that what she was supposed to do right now. She can't work right now. They won't see her till 02May2022, and she just started her job at the clinic she honestly does not know what else she needs to give them. They are okay with her missing, but she has to have like a paper work to see that she was going through this whole because of the vaccine. Reportedly the patient was provided with the number of Pfizer Medical Information and was requested to select option 3, timings as 8 am to 9 pm Monday to Friday.  No follow-up attempts are possible. No further information is expected.