passed out; pain goes on his neck and pop at the back part on the head, the part where it is hollow; pain goes on his neck and pop at the back part on the head, the part where it is hollow; palpitation; hard time turning head; heart runs fast; lumps on his armpits; lumps on his armpits, it has throbbing and burning-like sensation; lumps on his armpits, it has throbbing and burning-like sensation; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) from medical information team, Program ID: (Unknown). The reporter is the parent.  A male patient received BNT162b2, BNT162b2 omi ba.4-5 (BNT162B2, BNT162B2 OMI BA.4-5), on 23Dec2022 as dose number unknown (booster), single (Batch/Lot number: unknown) for covid-19 immunisation. The patient's relevant medical history and concomitant medications were not reported. Vaccination history included: Covid-19 vaccine (Primary immunization series completed; Manufacturer Unknown), for COVID-19 Immunization, reaction(s): "the heart thing happened about a month before the last vaccination". The following information was reported: AXILLARY MASS (non-serious) with onset 25Dec2022, outcome "unknown", described as "lumps on his armpits"; BURNING SENSATION (non-serious), PAIN (non-serious) all with onset 25Dec2022, outcome "unknown" and all described as "lumps on his armpits, it has throbbing and burning-like sensation"; LOSS OF CONSCIOUSNESS (hospitalization, medically significant), outcome "unknown", described as "passed out"; NECK PAIN (non-serious), HEADACHE (non-serious), outcome "unknown" and all described as "pain goes on his neck and pop at the back part on the head, the part where it is hollow"; PALPITATIONS (non-serious), outcome "unknown", described as "palpitation"; JOINT RANGE OF MOTION DECREASED (non-serious), outcome "unknown", described as "hard time turning head"; HEART RATE INCREASED (non-serious), outcome "unknown", described as "heart runs fast".  Clinical course: Calling for his son in prison. Very concerned because his son had his last booster of the Pfizer COVID-19 Vaccine Bivalent on 23Dec2022. Is the current formulation of the Bivalent. A day or second day after his son got the vaccine, son noticed lumps in his armpit described as throbbing and burning-like sensation. His son is having a hard time turning his head and the pain goes from the neck up to the top part of the back of head. Had little palpitations after receiving the vaccine described as the heart runs fast. Not too long ago his son passed out and was rushed to the hospital and by the time he got there the hospital didn't see anything wrong. Main thing is his son has these lumps in the armpit that are throbbing and burning. Tried to seek medical help in prison but the prison is slow with responding to medical problems. He was in prison and when a person was in prison they don't want to take care of them. Caller was asking what to do regarding what his son is experiencing. Previous agent couldn't mention anything to help ease the pain or anything but did provide information about lymph nodes being swollen and a little about the heart thing. A caller was asking for information on the after-effects of the COVID-19 vaccine. He mentioned that his son had an after-effect.  No follow-up attempts are possible; information about lot/batch number cannot be obtained. No further information is expected.