Dose Number 3; My left arm was red at injection area/a hard lump appeared under my skin/ the redness is gone as is the lump; My left arm was red at injection area/a hard lump appeared under my skin/ the redness is gone as is the lump; my was hot to the touch; it hurt terribly at the time of the injection and it still hurts three weeks later; is uncomfortable to move my arm; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 77 year-old female patient (not pregnant) received bnt162b2 (BNT162B2), administered in arm left, administration date 01Nov2021 16:00 (Batch/Lot number: unknown) at the age of 77 years as dose 3 (booster), single for covid-19 immunisation. The patient had no relevant medical history. Concomitant medication(s) included: IRBESARTAN; FAMOTIDINE; CAR. Past drug history included: Cortisone, reaction(s): "known allergies: Cortisone". Vaccination history included: Bnt162b2 (Dose Number: 2, Batch/Lot No: EL0140, Location of injection: Arm Left, Vaccine Administration Time: 01:00 PM), administration date: 06Feb2021, when the patient was 76 years old, for COVID-19 Immunization; Bnt162b2 (Dose Number: 1, Batch/Lot No: 3302, Location of injection: Arm Left, Vaccine Administration Time: 02:00 PM), administration date: 16Jan2021, when the patient was 76 years old, for COVID-19 Immunization. The following information was reported: IMMUNISATION (non-serious) with onset 01Nov2021 16:00, outcome "unknown", described as "Dose Number 3"; VACCINATION SITE ERYTHEMA (non-serious), VACCINATION SITE MASS (non-serious) all with onset 01Nov2021 16:00, outcome "recovered" (Nov2021) and all described as "My left arm was red at injection area/a hard lump appeared under my skin/ the redness is gone as is the lump"; FEELING HOT (non-serious) with onset 01Nov2021 16:00, outcome "not recovered", described as "my was hot to the touch"; VACCINATION SITE PAIN (non-serious) with onset 01Nov2021 16:00, outcome "not recovered", described as "it hurt terribly at the time of the injection and it still hurts three weeks later"; LIMB DISCOMFORT (non-serious) with onset 01Nov2021 16:00, outcome "not recovered", described as "is uncomfortable to move my arm". The events "my left arm was red at injection area/a hard lump appeared under my skin/ the redness is gone as is the lump", "my left arm was red at injection area/a hard lump appeared under my skin/ the redness is gone as is the lump", "my was hot to the touch", "it hurt terribly at the time of the injection and it still hurts three weeks later" and "is uncomfortable to move my arm" were evaluated at the physician office visit. Therapeutic measures were taken as a result of vaccination site erythema, vaccination site mass, feeling hot, vaccination site pain, limb discomfort.  Additional information: Prior to vaccination, the patient was not diagnosed with covid-19 and since the vaccination, the patient had not been tested with covid-19. The patient had not received any other vaccine in four weeks. Adverse event treatment noted as azithromycin, mupirocin ointment and clotrimazole.   The lot number for bnt162b2 was not provided and will be requested during follow up.