immune complex reaction; Left arm, where he got the Covid-19 vaccine swelled up left a black and blue mark on his left arm; Left arm, where he got the Covid-19 vaccine swelled up left a black and blue mark on his left arm; sick; hives; Couldn't sleep; rash on his body/Rash went all over his body; low grade fever the next day; 103-104 temperature; third booster; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 60-year-old male patient received BNT162b2, BNT162b2 omi ba.4-5 (BNT162B2, BNT162B2 OMI BA.4-5), on 26Oct2022 as dose 5 (booster), single (Lot number: GH9703) at the age of 60 years, in left arm for covid-19 immunisation; influenza vaccine (FLU VACCINE VII), on 26Oct2022 as dose number unknown, single (Batch/Lot number: unknown), in right arm for immunisation. The patient's relevant medical history included: "Blood pressure high" (unspecified if ongoing); "High cholesterol" (unspecified if ongoing); "Broken Back" (unspecified if ongoing). Concomitant medication(s) included: SIMVASTATIN; LISINOPRIL; VITAMIN D NOS; CYCLOBENZAPRINE taken for back injury. Takes Cyclobenzaprine because he broke his back twice jumping out of planes a long time ago. Vaccination history included: BNT162b2 (DOSE 1, LOT: EL1284), administration date: 05Jan2021, when the patient was 58-year-old, for COVID-19 immunization; BNT162b2 (DOSE 2, LOT: EL9264), administration date: 27Jan2021, when the patient was 58-year-old, for COVID-19 immunization; BNT162b2 (DOSE 3, LOT: EE8829 (cant tell for sure because they covered part of it with a sticker.)), administration date: 08Oct2021, when the patient was 59-year-old, for COVID-19 immunization; BNT162b2 (DOSE 4, LOT: FJ4989), administration date: 18Apr2022, when the patient was 59-year-old, for COVID-19 immunization. The following information was reported: EXTRA DOSE ADMINISTERED (non-serious) with onset 26Oct2022, outcome "unknown", described as "third booster"; BODY TEMPERATURE INCREASED (non-serious) with onset 27Oct2022, outcome "unknown", described as "103-104 temperature"; PYREXIA (non-serious) with onset 28Oct2022, outcome "unknown", described as "low grade fever the next day"; RASH (non-serious) with onset 31Oct2022, outcome "recovering", described as "rash on his body/Rash went all over his body"; TYPE III IMMUNE COMPLEX MEDIATED REACTION (medically significant), outcome "unknown", described as "immune complex reaction"; VACCINATION SITE SWELLING (non-serious), ECCHYMOSIS (non-serious), outcome "unknown" and all described as "Left arm, where he got the Covid-19 vaccine swelled up left a black and blue mark on his left arm"; ILLNESS (non-serious), outcome "unknown", described as "sick"; URTICARIA (non-serious), outcome "unknown", described as "hives"; INSOMNIA (non-serious), outcome "unknown", described as "Couldn't sleep". The patient underwent the following laboratory tests and procedures: Body temperature: (27Oct2022) 103-104; SARS-CoV-2 test: (unspecified date) Negative. Therapeutic measures were taken as a result of rash, insomnia. Clinical course: patient got the Pfizer Covid-19 booster, his third booster, and the flu shot the same day. Got one vaccine in each arm. Left arm, where he got the Covid-19 vaccine swelled up left a black and blue mark on his left arm. Got the vaccine on 26Oct2022. Went hunting, and a specific day he caught a virus that gave him a 103-104 temperature the first day, then a low grade fever the next day that stayed for a week. 5 days later, he got a rash on his body. The rash wouldn't go away. So, on Saturday he got sick, and by the next Friday the virus was gone, but on the following Wednesday, he got a rash. Rash went all over his body. Thought it was a Covid rash, but tests were negative for Covid. still has the rash. Has been four week. Went in for second round of prednisone today. Two weeks after he got the vaccines, he got some kind of virus that Saturday and on Wednesday a rash started and he still has that rash. Has had the rash since a specific day. Never had Covid. Never had an adverse effect either until this last shot. Never wants to see Pfizer again after that. That is the last shot he will get. Never had a reaction to the Pfizer vaccines or anything. Doctor said she didn't know for sure that the vaccine has anything to do with what happened, but she suspected that it played a part. Doesn't know what the virus was he got though. The Covid test was negative, so it wasn't Covid like he thought. Rash has gotten better. Went 8 days without treatment because he read the Covid rash lasted 8-10 days, and he thought that was what it was. 80% of his body was covered. Went to urgent care and they gave him prednisone and told him to follow up with PCP. So, for 8 days before going to urgent care, he couldn't sleep. Couldn't sleep at all for 3 days because the rash was so intense. The prednisone has gotten in under control and he has been able to sleep well the last few days. The prednisone is working. Doctor said that the virus turned on his immune system and it wouldn't turn off after it killed the virus. Which is why he started getting all the pretty bad hives. Official diagnosis was immune complex reaction. Hope he is done after this second course of prednisone. Took a lot of Benadryl to try to get the rash down and took Alka-Seltzer plus. He didn't get Covid at all. This was the first time he has had any reaction to anything.