rash down the front of her chest; This is a spontaneous report from a contactable consumer reporting for a patient (Wife). A 65-year-old female patient received bnt162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE, Formulation: Solution for injection, Batch/Lot Number: EN6206, NDC number and Expiry date are unknown), via an unspecified route of administration, administered in Left arm on 13Mar2021 around 07:30 AM at the age of 65-years-old as dose 2, single for covid-19 immunisation. Patient's medical history was none. There were no concomitant medications. The patient previously took first dose of historical vaccine, bnt162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE, Formulation: Solution for injection, Lot Number: EL9267), via an unspecified route of administration, administered in Left arm on 20Feb2021 at the age of 65-years-old around 07:30 AM as single dose for covid-19 immunisation. There was no Investigation assessment. Additional vaccines administered on same date of the pfizer suspect were none. Prior vaccinations within 4 weeks were none. Family medical history relevant to adverse events was none. Relevant tests were none. The reporter states he is calling for his wife who is the patient and he is calling about the Pfizer Vaccine. His wife had both doses of the Pfizer Vaccine. States the patient developed a rash down the front of her chest on an unspecified date in Mar2021. He stated that the patient got the 2nd dose of the vaccine this past Saturday on 13Mar2021 and today is Tuesday so obviously he thinks that the rash probably began on Sunday or Monday and states the rash is ongoing and thinks the rash has gotten lighter. He states the rash is still there but has gotten he thinks lighter. The adverse event did not require a visit to Emergency Room or Physician Office. Patient stated that she took Benadryl and was taking for the rash, the patient states she was taking Benadryl two as needed on Sunday then took two every 4-6 hours and the previous day she took one dose because she was having a friend over and they had wine so she stopped taking the Benadryl and does not know but thinks the lot for the Benadryl is SMF011 and states she can't read the lot number and then confirms it is SMF011 with expiration May2022. Patient initially stated the lot for the Benadryl is JL418 and then clarifies to state she is looking at the wrong product and JL418 is the lot number for her Cepacol which she did not take but states the Cepacol print is on light print because the manufacturer printed it on light print and she grabbed the wrong bottle thinking it was the Benadryl bottle. The reporter stated that he thinks that the patient developed a side effect from the vaccine which is a rash down the front of her chest and he was wondering what she could do for the rash. The reporter states the patient has a dermatologist and is assuming he guesses that the patient will go through the dermatologist and thought that this may have been reported before for the vaccine so he thought Pfizer may have recommendations on how to treat the rash. The reporter stated that her physician now is retiring and he does not know the information for the new physician. Patient states she has a list with her of what the side effects would be and asked what she could take for the rash; patient is aware she is referred to her HCP regarding treatment recommendations as Pfizer is not permitted to provide treatment recommendations or medical advice. The outcome of event was recovering.  No follow-up attempts are possible. No further information is expected.