booster; her feet started itching; rash; she developed welts on her legs and now they have spread to her arms as well.; hives; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 77 year-old female patient received bnt162b2 (BNT162B2), administration date 27Dec2021 10:00 (Batch/Lot number: unknown, Expiration Date: Mar2023) at the age of 77 years as dose 3, (booster) single for covid-19 immunisation. The patient's relevant medical history was not reported. Concomitant medication(s) included: THYROID SUPPORT FORMULA [ASCORBIC ACID;COPPER GLUCONATE;CYANOCOBALAMIN;FERROUS GLUCONATE;FOLIC ACID;IODINE;MAGNESIUM CITRATE;MANGANESE CITRATE;NICOTINAMIDE;PYRIDOXINE HYDROCHLORIDE;SELENOMETHIONINE;TYROSINE;ZINC CITRATE]; HYDROCHLOROTHIAZIDE. Vaccination history included: Bnt162b2 (Dose 1), administration date: 2021, for COVID-19 Immunization; Bnt162b2 (Dose 2), administration date: 2021, for COVID-19 Immunization. The following information was reported: IMMUNISATION (non-serious) with onset 27Dec2021, outcome "unknown", described as "booster"; PRURITUS (non-serious) with onset 27Dec2021, outcome "unknown", described as "her feet started itching"; RASH (non-serious) with onset 27Dec2021, outcome "unknown", described as "rash"; URTICARIA (non-serious) with onset 27Dec2021, outcome "not recovered", described as "she developed welts on her legs and now they have spread to her arms as well."; URTICARIA (non-serious) with onset 27Dec2021, outcome "unknown", described as "hives". Relevant laboratory tests and procedures are available in the appropriate section. Therapeutic measures were taken as a result of pruritus, rash, urticaria, urticaria Caller says she has been taking Benadryl for the rash, she was was taking one and it didn't help good, so yesterday she started taking two tablets because the package says adults can take up to two. She says the package says Benadryl Allergy, Diphenhydramine HC1 or HCl, 25mg tablets. She says been taking two since yesterday and this morning. She says it is helping once it kicks in, she takes it every six hours and when it is getting close to running out she starts itching again. She says it looks like she has hives or measles, it looks horrible, and itches terrible, it is red and blotchy and the actual things have got a hump on them, like they are swelled up like a bug bite. She says she bought it, Benadryl Allergy UPC: 31254717034, LOT: AJF062, EXP: Mar2023. She says that the UPC she can read easier because it is printed on there and not embossed.Caller says she had the two Pfizer shots when they were first giving them out, and then she just got the booster shot on Monday. She says she has a handwritten vaccine card and there don't seem to be any dates written on it for the first two doses. She says it does say she got the booster dose 27Dec2021. She says that is when the rash started, Monday. She provides other unknown dates 09Jan2021 and says the other looks like 01Mar2021 but she can't see something with the 3, because it is not written clear. She says she has her reading glasses on but the handwriting is so tiny it kind of all runs together, she might be able to read it with a magnifying glass but she can't read it.The lot number for bnt162b2 was not provided and will be requested during follow up.