Rash; This is a spontaneous report from a contactable consumer or other non health professional (patient). A 53-years-old-female consumer received BNT162b2 (PFIZER-BIONTECH COVID-19 VACCINE; Lot Number: EL9261), via an unspecified route of administration in the left arm on 01Feb2021 at 15:45 (at the age of 53-years-old) as a single dose for COVID-19 immunisation. Relevant medical history and concurrent conditions included allergy to penicillin, allergy to sulfa and Autoimmune deficiency. Prior Vaccinations (within 4 weeks) medical history included Shingles Oct2020 and flu. other relevant medical history including but not limited to these conditions: diagnosed allergies, compromised immune status, respiratory illness, genetic/chromosomal abnormalities, endocrine abnormalities (including diabetes) and obesity. History of all previous immunization with the Pfizer vaccine was not considered as suspect. Her weight was 158-160lbs. Prior to the vaccine, she had a rash that popped up a week before. Her doctor told her to keep taking Zyrtec DM and take Benadryl orally. Caller mentioned a one time occurrence with shortness of breath, and she took Benadryl and that helped. That incidence had nothing to do with the vaccine. She only has a rash when she is allergic to something she has taken internally. She doesn't know what the original rash was from. She thinks it was from using expired deodorant. It was expired for 2 years. She developed the rash under her arms. She was on prednisone for 5 days, and the rash went away. She was fine. Then, 4-5 days later, she could get the vaccine. Then, she received the Pfizer vaccine on 01Feb2021 (Monday), and on 03Feb2021 (Wednesday) she had a rash all over again. It was worse than it was before. She doesn't know if it was related. It was just on her torso/side. When the break out did happen, she had some on her leg too, She was very allergic to sulfa. She was wondering if the Pfizer vaccine breaks down into a sulfaride when it was in the body. She doesn't know whether to get the second vaccine or not. When she was in her 20s, she was on a birth control pill, and she had an allergic reaction to it. The pharmacist said the ingredients in it break down into sulfarides even though sulfa isn't an ingredient. So she as wondering if this was the same. She doesn't have the name, NDC, lot, or expiration for the birth control. She was allergic to sulfa, and she doesn't want it to happen to someone else. She works for the public She got the vaccine at (Address). Her director put them all in line to get the vaccine because she deals with the public. It happened over the weekend. The doctor didn't want to do an oral prednisone this time because of the vaccine. So she gave her a hydrocortisone cream to use on the rash. She thinks it was 2.5. It was like a prickly rash. She could feel it. If she wears something loose then she doesn't feel it. She took a bath with Aveeno oatmeal which aggravated more because of the heat. No details from the Aveeno was provided . She hasn't used creams or perfume since Friday. The rash had gone away with cortisone cream. This time it came back a lot stronger than before. She has pictures if Pfizer would want them. She was wondering if she should get the second dose? She was scheduled for the second dose on 22Feb2021. Relevant tests included the list other relevant diagnostic and confirmatory test results for event(s), for example, from blood tests, cerebrospinal fluid culture, bacterial sero-type, diagnostic imaging, (e.g., chest X-ray, MRI): no PSCC communication: The caller was provided Medical Information's number of #, option 3, and placed in queue due to high call volumes. The outcome of event rash was recovering.