Developed hives all over my body, torso, arms and legs; I have allergic reaction after first shot of Pfizer covid 19; This is a spontaneous report from a contactable consumer (patient).  A 52-years-old female received first dose of bnt162b2 (PFIZER BIONTECH COVID-19 mRNA VACCINE, Solution for injection, Lot Number was not reported) via an unspecified route of administration on 19Mar2021 (age at the time of vaccination was 52-years-old) as DOSE 1, single for COVID-19 immunization. Medical history and concomitant medications were not reported. On 19Mar2021, the patient experienced I have allergic reaction after first shot of Pfizer COVID 19. On 21Mar2021 (2 days after the vaccination), the patient developed hives all over my body, torso, arms and legs. The patient stated she had allergic reaction after first shot of Pfizer COVID- 19 vaccine on 19Mar2021, 2 days later, developed hives all over my body that lasted more than a week. It just calmed down on Monday, she was scheduled to have 2nd shot this Friday, 09 APR 2021. She can not seem to get a straight information from doctor on whether to get second dose. Her husband went to get 2nd shot this morning, the doctor at vaccination site station, told her that she should not get it, because he is afraid the second vaccine is stronger than the first one, and may have a more severe reaction to the second. She asked if she should get the second shot, if she take second shot would it be worse or what would she do. She was not confident in her doctor. If you received a second shot, Side effects after your second shot may be more intense than the ones you experienced after your first shot. These side effects are normal signs that your body is building protection and should go away within a few days. Explained that Pfizer was unable to assess the causality of what she was experiencing was related to the COVID-19 vaccine and referred to HCP for determining whether or not she was experiencing a severe allergic reaction to the vaccine and if she should received the second dose. The Investigation Assessment was Not Provided. Additional Information: Caller confirmed that she was calling about the Pfizer COVID-19 Vaccine. She stated that she was concerned about getting the second shot this Friday. She that she got her first vaccine on 19Mar2021, and then two days after the first shot, she developed hives all over her body, starting on the torso, arms, and legs, which lasted for over a week. She stated the hives cleared up this past Monday. She reclarified that she could not find any information if she should go ahead and get the second shot. She stated that she was getting mixed messages from her doctor and other people regarding if she should get the second vaccine. She stated that Pfizer was the manufacturer, and wanted to know if there was information regarding this reaction. She asked if information has been collected on what happens to people that have had this reaction, and what happens after the second shot. She reclarified that this morning she talked to her doctor and he did not knew much. She reclarified, and stated on Monday she talked to her doctor again, and asked if she should switch to the other vaccine. She stated her doctor thinks that she should go ahead with the Pfizer vaccine. She stated this morning, her husband went to get his second shot, and talked to a different doctor, who supervised the vaccination site, about her condition. She stated that doctor did not recommend that she go ahead with the second shot with Pfizer, because he, the doctor, thought it was an allergic reaction to the protein in Pfizer's vaccine. She notified that Medical Information and/or Pfizer was unable to provide medical advice but may have resources to help answer some questions. The outcome of the event developed hives all over my body, torso, arms and legs was recovering and outcome of the other event was unknown  No follow-up attempts are needed. No further information is expected.