third dose; Kaposi's sarcoma; This is a spontaneous report received from contactable reporter(s) (Consumer or other non-HCP). The reporter is the patient.  A 73-year-old male patient received bnt162b2 (BNT162B2), administered in arm left, administration date 29Sep2021 (Lot number: ER8735) at the age of 73 years as dose 3 (booster), single for covid-19 immunisation; influenza vaccine (FLU), administered in arm right, administration date 29Sep2021 (Batch/Lot number: unknown) as dose number unknown, single for immunisation. The patient had no relevant medical history. There were no concomitant medications. Vaccination history included: Bnt162b2 (First Dose, Lot: EK4176), administration date: 14Jan2021, when the patient was 72 years old, for Covid-19 Immunization, reaction(s): "Kaposi's sarcoma"; Bnt162b2 (Second dose, Lot: EL9261), administration date: 04Feb2021, when the patient was 72 years old, for Covid-19 Immunization, reaction(s): "Kaposi's sarcoma". The following information was reported: IMMUNISATION (medically significant) with onset 29Sep2021, outcome "unknown", described as "third dose"; KAPOSI'S SARCOMA (medically significant) with onset 2021, outcome "not recovered", described as "Kaposi's sarcoma". The event "kaposi's sarcoma" was evaluated at the physician office visit. The patient underwent the following laboratory tests and procedures: biopsy: (Dec2021) kaposi's sarcoma. Therapeutic measures were taken as a result of kaposi's sarcoma.  Clinical course: The patient thought he might have had an adverse reaction. He saw a video that they did in a studio where someone interviewed people. He clarifies it was like a news program, he doesn't know which one it was but there was a study done in (withheld) where people got Kaposi sarcoma as side effects from the vaccine. Something must have happened to have gotten them. He got his second one removed just this week and it sort of scared him. He confirms he was calling to report this information. Caller states he didn't inform his doctor about the side effects yet. When probed to determine when was diagnosed, he explains the first one (lesion) was about 6 months ago. The second one (lesion) was removed about a week ago. He clarifies later during the call they took it out more than week ago. He clarifies he had a biopsy done and with the second one when he got the results, he was handed a piece of paper that said he had Kaposi sarcoma. When probed for the outcome, the caller explains the doctor did a scraping but didn't get it all. He clarifies he asked his doctor did he get it all and the doctor said he believed they did but told him to come back in a month so he can be checked out and to make sure he was healing right.  Caller makes the comment he feels like it is getting infected. He was given a topical antibiotic cream and he doesn't know if it's working yet. Patient provided the following details for the antibiotic cream: Mupirocin Ointment (generic for Bactroban), LOT: 19213736, Manufacturer: Glenmark, underneath that he sees TN/HC. Also, he confirms there is pharmacy label on it with a discard after date:  25Nov2022. Time the vaccination was given as unknown, sometime probably late morning because he doesn't get up early anymore. Prior Vaccinations (within 4 weeks) If applicable, list any other vaccinations within four weeks prior to the first administration date of the suspect vaccine(s), AE(s) following prior vaccinations and Patients Medical History (including any illness at time of vaccination) was reported as none. Family medical history relevant to AE(s) was not provided.