developed a little red spots on the back of their leg, close to their knees at the calf was reported as worsened; developed a little red spots on the back of their leg, close to their knees at the calf was reported as worsened; one leg is red and a little bit swollen close to the knee at the calf was reported as worsened; muscle pain; back ache; headache; he had the lymph node swelling in his arm pit and the same thing with his leg as hers; Booster; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) from medical information team.  A 38 year-old male patient received bnt162b2 (BNT162B2), administration date 01Oct2021 (Batch/Lot number: unknown) at the age of 38 years as dose 3 (booster), single for covid-19 immunisation. Relevant medical history included: "regular allergies" (ongoing). The patient's concomitant medications were not reported. The following information was reported: IMMUNISATION (non-serious) with onset 01Oct2021, outcome "unknown", described as "Booster"; JOINT SWELLING (non-serious), RASH MACULAR (non-serious) all with onset 02Oct2021, outcome "unknown" and all described as "developed a little red spots on the back of their leg, close to their knees at the calf was reported as worsened"; CONDITION AGGRAVATED (non-serious) with onset 02Oct2021, outcome "unknown", described as "one leg is red and a little bit swollen close to the knee at the calf was reported as worsened"; MYALGIA (non-serious) with onset 02Oct2021, outcome "unknown", described as "muscle pain"; BACK PAIN (non-serious) with onset 02Oct2021, outcome "unknown", described as "back ache"; HEADACHE (non-serious) with onset 02Oct2021, outcome "unknown", described as "headache"; LYMPHADENOPATHY (non-serious) with onset 02Oct2021, outcome "unknown", described as "he had the lymph node swelling in his arm pit and the same thing with his leg as hers".  Additional Information: New AE information obtained from the caller. Consumer reporting side effects from the Pfizer BioNTech Covid19 Booster dose. Per caller, she and her boyfriend had the booster dose, she had her booster dose on 30Sept2021, while her boyfriend had the booster dose on 01Oct2021. They both developed a little red spots on the back of their leg, close to their knees. She developed the red spots last night, while her boyfriend developed the day after the shot. She described it as, a little bit swollen, when she touch it it's hard and it's very red. She also added that the red spot is exactly behind her knee. She wants to know if this has been reported?  Additional Context: The report is cross referenced to report ID: 5IU4OFZ3. In the original report the caller was reporting AE/ MI following her booster dose of the COVID vaccine with the reason for the call being that both of her legs are red and a little bit swollen close to her knee on the back of her calf. It is the weirdest pain that she has ever felt.  Reporter Details: Declined mailing address. During the report she mentioned that her boyfriend took the vaccine on Friday and he started with this yesterday, the same thing as her, but his is just on one leg. He had his COVID vaccine on 01OCT2021. He is calling his doctor right now and she doesn't know if he will also call Pfizer, she gave him Pfizer's number but she can add his information as well but she may not be able to give a lot.  Primary Healthcare Professional Info: Declined. He has one but she does not have their information to provide. Event Details: Her boyfriend had his booster dose one day after she did and his side effect started on Saturday in the middle of the night she thinks. The only thing that he is still complaining about is his leg and he said that his arm pit lymph nodes just have light pain now. His other side effects are gone. He has had no fever but he had muscle pain, back ache and headache. And he had the lymph node swelling in his arm pit and the same thing with his leg as hers. Inquired for outcome for his leg and she says that her boyfriend said it got worse and it is really red. Suspect Product: Caller confirms that her boyfriend had the booster dose. Inquired for NDC, lot number and expiry date and caller declined to provide since she does not have this information.  Follow-up attempts are completed. No further information is expected.