tightening and twitching at the injection site; the muscle has been tensioning and twitching; the muscle has been tensioning and twitching; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) from medical information team for a Pfizer sponsored program. The reporter is the patient.  A 35 year-old male patient received bnt162b2 (BNT162B2), administered in arm left, administration date 07May2021 (Batch/Lot number: unknown) at the age of 35 years as dose 2, single for covid-19 immunisation. Relevant medical history included: "allergy to eggs" (unspecified if ongoing). The patient's concomitant medications were not reported. Vaccination history included: Bnt162b2 (DOSE 1, SINGLE), administration date: 16Apr2021, when the patient was 35 years old, for COVID-19 Immunization. The following information was reported: VACCINATION SITE DISCOMFORT (non-serious) with onset 16May2021, outcome "not recovered", described as "tightening and twitching at the injection site"; MUSCLE TWITCHING (non-serious), MUSCLE TIGHTNESS (non-serious) all with onset 16May2021, outcome "not recovered" and all described as "the muscle has been tensioning and twitching".  Additional information: Caller received the second dose of the Pfizer-BioNTech COVID-19 Vaccine last 07May2021. Caller reported that by 16May2021, he began experiencing "tightening and twitching at the injection site", and asked if this was associated with the vaccine. The caller Mentioned no information found on "tightening and twitching at the injection site", and referred to HCP for guidance. He was calling about the Pfizer COVID vaccine. He received the second dose 07May2021 and where the injection was given, the muscle has been tensioning and twitching and he was wanting to know if that  normal. He was wondering if it was normal to happen especially so long after the vaccine. It tightens up to the point that it hurts and then it starts twitching and sometimes it goes away, sometimes it comes back like 30 seconds later, sometimes an hour later, it started like 2 days ago. He confirms the second dose was given on 07May2021. The twitching and tightening started 16May2021. He confirms this was at the injection site which was his left upper arm, he said it was right where they gave the shot which was why he was calling if it was somewhere else he would not be calling but it was right where they gave the injection. He says it happened just before he called. Product details: Caller does not have his vaccine card with him, he was unable to provide NDC lot expiration for his Pfizer COVID 19 vaccine doses. Additional Vaccines Administered on Same Date of the Pfizer Suspect: None, caller does not have NDC lot expiration for his first or second dose with the Pfizer COVID 19 vaccine. He confirmed his first and second dose are his only history with this product. AE(s) did not required to a visit Emergency Room. Patient had not gone to Physician Office that was why he was making sure he was good because of the horror stories where someone has spams and then they end up in a coma for 2 months. When he was looking up stuff online he saw a story where someone had muscle twitches 15 days after the vaccine and then ended up in the hospital but he never knows if things he reads on the internet was true. He wanted to call and talk to the professionals. No further information provided. Prior Vaccinations (within 4 weeks): the first dose of the vaccine was given 4 weeks prior. They went exactly 4 weeks to the day they made sure of it, him and his wife went 4 weeks to the day for the second dose, his first dose was 16 Apr 2021, he confirmed he does  NDC lot expiration for either his first of second dose.AE(s) following prior vaccinations was None, he was not allowed to take the flu vaccine so he had never tested it, he just didn't take a it because he was allergic to eggs. he knows a lot of flu vaccines was made with egg so he didn't took a chance. Patient's Medical History (including any illness at time of vaccination), Family Medical History Relevant to AE(s) and Relevant Tests was None  This follow-up is being submitted to notify that the lot/batch number is not available despite the follow-up attempts made. Follow-up attempts completed. No further information is expected.