blisters on the tongue; extremely dry mouth since Saturday; pain in the arm; This is a spontaneous report from a contactable consumer, the patient and physician. A 66-year-old female patient received first dose of bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, solution for injection, Lot Number: EL9264) intramuscular administered in top of right arm on 29Jan2021 at 13:30 as single dose for COVID-19 immunization at hospital. Medical history included ongoing Sjogren's disease (which caused a dry mouth), MGUS (Monoclonal gammopathy of undetermined significance) diagnosed about 26 years ago and acid reflux. When she was first diagnosed with Sjogren's, she had a swollen tongue. She had a prior medical condition called M spike. M spike which is a protein band in her blood which could turn in melanoma, she did not have it right now, but she could get it back. Her weight was from a few days ago when she went to the doctor's office, prior to getting the vaccine. She has not talked to her doctor yet. Patient had flu vaccine and pneumonia vaccine. Concomitant medication included dexlansoprazole (DEXILANT), 60 mg capsule once a day by mouth taken for acid reflux from Jan2021 and ongoing. She had been taking it for a week. The patient stated that she had whooping cough and arm pain for a long time with prior vaccinations. She did not know the name of the vaccine or have a lot number to provide. The patient did not receive any prior vaccinations within 4 weeks. The patient received the first dose of the Pfizer COVID-19 vaccination on Friday, 29Jan2021. She had the usual flu pains of the right arm on Friday. She put ice on her arm, she had no problems with it now. She clarified the pain in her arm is the same pain as she got with the flu vaccine. She had a little bit of pain on Friday after getting the COVID vaccine. She did not know the name of the flu vaccine she received when she had pain in her arm, but she got the flu vaccine and pneumonia vaccine together a while ago. After the shot, she experienced extremely dry mouth since Saturday (on 30Jan2021). Patient had dry mouth from her Sjogren's but not this much like she was experiencing after the vaccine, this was a flare up of her Sjogren's which she has not had in years. She was scared since she had swollen bumps on her tongue, stated they were little blisters on her tongue that started to develop on Sunday (on 31Jan2021). The blisters were slightly better, but she could still felt them. Patient declined any treatment; she was drinking water. Patient did not require a visit to emergency room/physician office. No relevant tests were done. Patient's height was 5'2 and 3/4 or 5'3'', reported she was shrinking. Patient stated that there was not much information about Sjogren's and the COVID vaccine. She checked with her hematologist/oncologist and was advised to get the COVID vaccine. Till yesterday, patient had a little bit of pain in right arm and today she had nothing. Patient recovered completely yesterday on 31Jan2021. Outcome of the event dry mouth was not recovered while of little blisters on tongue was recovering. Investigation Assessment: No.   Follow-up attempts are completed. No further information is expected. Information about lot/batch number is not available despite the follow-up attempts made.