enlarged obvious varicose veins on the frontside of her calf; enlarged obvious varicose veins on the front side of right calf are not a real dark purple, they're a lighter purple-blue color; when she went to bed the front of her right shin itching; Booster dose: right arm is sore; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 80 year-old female patient received bnt162b2 (COMIRNATY), administered in arm right, administration date 13Oct2021 11:00 (Lot number: FE3590) at the age of 80 years as dose 3 (booster), single for covid-19 immunisation. Relevant medical history included: "mosquito bite", start date: Oct2021 (unspecified if ongoing); "she had a dizzy spell" (unspecified if ongoing), notes: she had a dizzy spell, and very high blood pressure; "high blood pressure" (unspecified if ongoing). The patient's concomitant medications were not reported. Vaccination history included: Bnt162b2 (Dose Number:01, Lot: EL9263, Dose: Unknown strength/volume/dose injection to right arm around 09:00-09:30), administration date: 27Jan2021, when the patient was 79 years old, for Covid-19 Immunization; Bnt162b2 (Dose Number:02, Lot: EL9267, Dose: Unknown strength/volume/dose injection to right arm around 09:00-09:30-verified information is the same for both first and second doses), administration date: 19Feb2021, when the patient was 79 years old, for Covid-19 Immunization. The following information was reported: VARICOSE VEIN (non-serious) with onset 13Oct2021, outcome "not recovered", described as "enlarged obvious varicose veins on the frontside of her calf"; SKIN DISCOLOURATION (non-serious) with onset 13Oct2021, outcome "unknown", described as "enlarged obvious varicose veins on the front side of right calf are not a real dark purple, they're a lighter purple-blue color"; PRURITUS (non-serious) with onset 13Oct2021, outcome "unknown", described as "when she went to bed the front of her right shin itching"; VACCINATION SITE PAIN (non-serious) with onset 13Oct2021, outcome "recovering", described as "Booster dose: right arm is sore". Relevant laboratory tests and procedures are available in the appropriate section.  Additional Information: She had enlarged obvious varicose veins on the front side of her calf. She also reported about non-Pfizer product that she read that people who got the J & J vaccine had reactions to their varicose veins, so called to see if that was true for Pfizer. She mentioned later in the report that she got a mosquito bite probably 3-4 days before 07Oct2021 right in the middle of the site of the enlarged obvious varicose veins on the front side of her right calf later developed. There was a big red spot. She reported this because if she sent a picture, you would see a red circle and they put an ink line drawn around it to watch the size, which is about the size of a quarter. She was seen at the emergency room for the mosquito bite where they tested her for west nile virus which was negative. On 07Oct2021 when she walked into the emergency room she had a dizzy spell, and very high blood pressure. She does not believe that the mosquito bite, dizzy spell or very high blood pressure is related to the Pfizer-BioNTech Covid-19 Vaccine, does not have anything to do with that. Enlarged obvious varicose veins on the front side of right calf: They were not raised, they were flat but some are like spider-like ones, she has varicose veins, but they were more...it happened to be on the same side of the body as the booster shot of the vaccine; so she was just wondering if this is old age, is it just coincidence or has someone else that with the Pfizer-BioNTech Covid-19 Vaccine. The enlarged obvious varicose veins on the front side of right calf are not a real dark purple, they were a lighter purple-blue colour. She noticed the reaction wasn't immediate. She was fine. She has had no bad reaction to any of the Pfizer-BioNTech Covid-19 Vaccine shots. Onset time probably around 20:00-20:30 when she noticed; she noticed when she went to bed the front of her right shin itching so she looked at it and noticed the enlarged obvious varicose veins on the front side of right calf. Right arm was sore: Onset time was a couple of hours after getting home after getting the booster dose. With the first 2 shots of Pfizer-BioNTech Covid-19 Vaccine she could hardly tell she got them, she didn't really even have a sore arm, she wasn't even sure she got it. She had no reactions to the first 2 shots of Pfizer-BioNTech Covid-19 Vaccine. With this booster dose her right arm is sore, but not as sore as a flu shot, barely sore. When she went into the emergency room on 07Oct2021 she had very high blood pressure so she wore a blood pressure monitor for 24 hours and turned it in on Monday but does not have any further information or results from that yet. Expiry/NDC: Unknown.  No follow-up attempts are possible. No further information is expected.