swelling and it felt numb, the numb feeling starting on left side of cheek and wound up settling in upper lip; swollen gland he noticed on the left side; the swelling in the mouth on the 11Feb2021 on his lip lasted about 2 days,his upper lip irritated on inside for a day or 2,; swelling that occurred in his mouth/1st occurrence of swelling was like golf ball size, it was visible; This is a spontaneous report from a contactable consumer (patient). A 79-years-old male patient received bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, Solution for injection, Batch/Lot Number: EL3248), dose 1 via an unspecified route of administration, administered in Arm Left on 27Jan2021 11:00 (at 79-years age) as single dose for covid-19 immunisation. Medical history included diabetes and hypertension (he was diabetic and was on blood pressure medication, but both his hypertension was under control, and his diabetes, sure his A1C is higher than it should be but was under control with oral medication), root canal infection (though this was contributed to the root canal which he had on 29Jan2021, the root canal was on the lower left of the mouth, tooth number 20). Patient provided relevant Family medical History of Hypertension. Concomitant Medications: He was just taking his general medications, like his maintenance medication, nothing out of the normal. He had no other vaccines on the same day as the covid vaccine or in the 4 weeks prior. He had no positive covid or antibody test prior to the first dose (he had never had a test).On 08Feb2021, the patient had the 1st occurrence of swelling was like golf ball size, it was visible, but it went away after 3-4 hours and he didn't have to take anything. Then on the 11Feb2021, the patient woke up at 4:30AM, experienced the swelling and it felt numb, the numb feeling starting on left side of cheek and wound up settling in upper lip, it gave him a distorted appearance, it was severe. The swelling in the mouth, that wound up settling in upper lip which was the 2nd occurrence in a 3-day period. The first occurrence was swelling, not as severe, in the lower inside of the mouth in the lower right inside of the gum, the swelling appearance from the outside, though this was contributed to the root canal (had on 29Jan2021). The swelling in the mouth from 08Feb2021 subsided for him in 3-4 hours. He called endodontist, and told her about the second swelling, she said to come in and look at it, that was on 11Feb2021, she took X-rays and result was normal, she said it was not connected to the root canal and told him to contact his Primary and go from there, he agreed with her because he did not feel any type of sensitivity. On 11Feb2021, patient then called the Primary Care doctor, told how he developed the swelling, and the primary care said that he would rather see an ENT specialist and he got an appointment with the ENT that same day 11Feb2021 at 15:00 in the afternoon. The patient went to see him, the ENT checked his mouth out, checked his nose and throat, he did not know what it was stemming from, and said he will put him on an antibiotic. On 11Feb2021, the ENT said that the patient did had a swollen gland he noticed on the left side. The swelling in the mouth on the 11Feb2021 on his lip lasted about 2 days, his upper lip irritated on inside for a day or 2, but it lasted till about the 13Feb2021. On 11Feb2021 (5 days ago), the patient was put on an antibiotic for swelling that occurred in his mouth which was Clindamycin HCL 300mg, 3 pills a day with his last 2 pills of antibiotics falls same day (18Feb2021) as his second vaccine dose was scheduled on Thursday (18Feb2021; appeared to be scheduled outside of the 21-day recommendation). Patient felt like he was sort of on edge for another occurrence possibly happening. Being on the antibiotic, maybe this was some type of infection. The ENT told honestly that he didn't know why this happened, but if it happened again, he might have a CT scan for the suspect salivary gland, maybe it was clogged or there was an infection in the gland. He asked if he should take the pills or reschedule the vaccine dose and if it was ok to receive the second shot while on this antibiotic (his prescribing doctor couldn't give an answer). On 18Feb2021, the patient was due to have booster. Patient would have 2 pills left on the 18Feb2021, after that he was finished. Therapeutic measures of antibiotic were taken as a result of swelling that occurred in his mouth (mouth swelling). He did not have to go to the emergency room for the mouth swelling but he has visited the physician's office. The outcome for swelling in the mouth and lips was recovered on 13Feb2021 (Duration 5 Day); outcome for swollen gland was unknown.  Follow up (16Feb2021): This is a follow up spontaneous report from a contactable consumer. This consumer reported patient information, new event information.