blisters; left leg right by, the upper side of his leg right next to, beside his parts, there is a muscle that is tender; little rash behind the knee cap on the upper side of his leg; red spots behind knee cap, upper side calf/dots on the joint before foot and leg/three little dots on top of the upper side of his foot where his leg bone meets his foot; redness; This is a spontaneous report from a contactable consumer (patient). A 56-year-old male patient received second dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, formulation: Solution for injection, Lot Number: EW0179, and Expiration date: Unknown), via an unspecified route of administration, administered in left arm on 05May2021 11:40 (at the age of 56-year-old) as dose 2, single for COVID-19 immunization, at pharmacy. The patient medical history and concomitant medications were none. The patient had no family medical history relevant to adverse events. The patient stated "he takes no medications, does not drink". No investigation assessment was performed. The patient previously received first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, formulation: Solution for injection, Lot Number: ER8729, and Expiration date: Unknown), via an unspecified route of administration, administered in left arm on 07Apr2021 (at the age of 56-year-old) as dose 1, single for COVID-19 immunization. No additional vaccines administered on same date of the Pfizer suspect. No prior vaccinations within 4 weeks. No adverse events following prior vaccinations. It was reported that, the patient received the second shot of Pfizer COVID Vaccine on 05May2021. He noticed on 07May2021 (Friday), some red spots behind knee cap, upper side calf and thought it was spider bite. The patient stated on 07May2021, he kind of developed a little rash behind the knee cap on the upper side of his leg. The patient stated it was on his "left leg right by, the upper side of his leg right next to, beside his parts, there is a muscle that is tender" and it started about the same time Friday (on 07May2021) and it was ongoing. It was like when he splits like when he was exercising and splits a little bit too much for too long. The patient confirmed it was persisting. Over the weekend, it got worse, and it became like blisters after 2 days or on 08May2021 (Sunday). The patient stated he did not know anything about the side effects other than rashes on his arm but to him it was already blisters and he thought maybe he got bitten by a spider. Monday night it got worse. He also noted that yesterday morning on 11May2021, he again noticed "dots on the joint before foot and leg /three little dots on top of the upper side of his foot where his leg bone meets his foot", its not really on his foot, just when it becomes your foot and that one got a little bit more red, more rash, but it had not expanded or anything. The patient reported it was on the upper side of his calf, left, the rash. It probably started Saturday and got bigger on Sunday. On an unspecified date in 2021 (maybe yesterday 11May2021), there was redness on the outside, like around it, and the redness kind of disappeared but the blisters turned a darker color with a little bit of redness on the side. On Sunday, it was pretty bad, the blisters and redness. On Monday, the redness around it, he would say a quarter inch around, it kind of disappeared. The redness beyond the affected area, its gone. The blisters turned a brownish dark color, it got better in the sense that there was no redness around it, the blisters itself. The patient was told not to pop them, it was just red around the blisters now. The patient tried to make a doctor's appointment on 10May2021 (Monday) and the next available appointment was today (on the day of reporting 12May2021) and he thought he could last that long but then on Tuesday (on 11May2021), he went to an urgent care and when he was talking to the doctor there at the urgent care, at the end of the conversation, she told him about the second shot, that is the only thing out of the norm for him. He stated the doctor said people had reported blisters on their fingers and toes and rash, so most likely that was what it was, and they were going to leave it alone. The patient stated the doctor did not do any treatment for the events. The doctor told patient not to touch the blisters, it might go away and if it got worse to come back to see her. The patient asked how long it would take to get better and how long will the rash/blisters would last, and what should he expect. The doctor did not give any guidance. The events resulted in emergency room and physician office visit. No relevant testes. The outcome of events blisters, redness, and little rash behind the knee cap on the upper side of his leg was reported as resolving. The outcome of event "left leg right by, the upper side of his leg right next to, beside his parts, there is a muscle that is tender" was reported as not resolved. The outcome of event "red spots behind knee cap, upper side calf/dots on the joint before foot and leg/three little dots on top of the upper side of his foot where his leg bone meets his foot" was unknown.  No follow-up attempts are needed. No further information is expected.