booster has broken out in hive actually on the opposite side of my body than the side I got the shot on/developed hive on my right upper arm, my right lower leg and my right foot; I received my Pfizer booster on Monday; This is a spontaneous report from a contactable other hcp or nurse (patient).   A 75-year-old female patient received third dose of bnt162b2 (PFIZER-BIONTECH COVID-19 MRNA VACCINE, formulation: solution for injection; batch or lot number: 939905) via an unspecified route of administration, administered in left arm (upper)on 08Nov2021 (age at the time of vaccination: 75 year-old) as dose 3 (booster), single for covid-19 immunization. The patient's medical history included hypertension (nothing serious), thyroid and blood pressure from an unknown date and unknown if ongoing. The patient's concomitant medications included metoprolol (METOPROLOL) taken for blood pressure, start and stop date were not reported and nurse stated medication for thyroid and stated she believe it is called NP and no further details provided. Patient previously received first dose of bnt162b2 (PFIZER-BIONTECH COVID-19 MRNA VACCINE, formulation: solution for injection; batch or lot number: not reported) via an unspecified route of administration on unspecified date as dose 1, single for covid 19 immunization and experienced pain in arm and received second dose of bnt162b2 (PFIZER-BIONTECH COVID-19 MRNA VACCINE, formulation: solution for injection; batch or lot number: not reported) via an unspecified route of administration on unspecified date as dose 2, single for covid 19 immunization. No other prior vaccination received within 4 weeks for covid vaccination. The patient received Pfizer booster on Monday (08Nov2021) and on 09Nov2021, patient experienced booster has broken out in hive on the opposite side of her body than the side she got the shot on/ developed hive on my right upper arm, my right lower leg and my right foot. The patient reported that she called the pharmacy where she received her Pfizer booster on Monday. She didn't know if she had to report any kind of reaction to it. She did not have a reaction to the first 2 and this booster has broken out in hive actually on the opposite side of her body than the side she got the shot on. So she called the pharmacy and they gave her the phone number to call. She reported that day and a half later, she developed hive on her right upper arm, her right lower leg and her right foot. The patient received an 1 pill of Allegra and used Cortisone cream as a corrective measure. Nurse was informed about the role of Pfizer drug safety. Nurse stated, just wanted to make sure that, and she did look it up and she noticed that there have been reactions like mine. So, she just wanted to make sure that if it is needed to be reported, she reported it. The patient underwent lab tests and procedures on unspecified date in 2021 which included thyroid and results unknown and test date was about 1 month ago. The outcome of the event was unknown.   The causality reported as she believes it was, yeah. Reaction assessed: booster has broken out in hive actually on the opposite side of my body than the side I got the shot on and I developed hive on my right upper arm, my right lower leg and my right foot and Source of assessment: Primary Source Reporter and Method of assessment: panel and Drug result: Related   Follow-up attempts are completed. No further information is expected.