Dent in arm, darkened color, getting bigger/bruise looking thing is on her left upper arm/ located on left upper arm right where she got the shot basically; Dent in arm, darkened color, getting bigger/located on left upper arm right where she got the shot basically; Dent in arm/located on left upper arm right where she got the shot basically; Tonsils removed; tendonitis; This is a spontaneous report received from contactable reporters (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 19-year-old female patient received BNT162b2 (BNT162B2), on 13Feb2022 as dose 3 (booster), single (Lot number: FJ1014) at the age of 18 years, in left arm for covid-19 immunisation. The patient's relevant medical history included: "right hip surgery", start date: Jul2019 (unspecified if ongoing), notes: Hip surgery thinks her right hip surgery was Jul2019 and her left hip surgery was like Sep2020; "left hip surgery", start date: Sep2020 (unspecified if ongoing), notes: Hip surgery thinks her right hip surgery was Jul2019 and her left hip surgery was like Sep2020; "Help with anxiety" (unspecified if ongoing), notes: Help with anxiety. Concomitant medication(s) included: WELLBUTRIN taken for anxiety. Vaccination history included: BNT162b2 (Dose: 01, Pfizer Covid 19 vaccine dose #1 on 13Jul2021 in her right arm she thinks around 2 maybe. lot EW0178), administration date: 13Jul2021, when the patient was 18-year-old, for COVID-19 Immunization; BNT162b2 (Dose: 02, Pfizer Covid 19 vaccine dose #2 on 03Aug2021 in her right arm around 1pm. lot EW0180), administration date: 03Aug2021, when the patient was 18-year-old, for COVID-19 Immunization. The following information was reported: TONSILLAR HYPERTROPHY (medically significant) with onset May2022, outcome "unknown", described as "Tonsils removed"; TENDONITIS (non-serious) with onset 2022, outcome "not recovered"; VACCINATION SITE BRUISING (non-serious) with onset 29Jun2022, outcome "not recovered", described as "Dent in arm, darkened color, getting bigger/bruise looking thing is on her left upper arm/ located on left upper arm right where she got the shot basically"; VACCINATION SITE DISCOLOURATION (non-serious) with onset 29Jun2022, outcome "not recovered", described as "Dent in arm, darkened color, getting bigger/located on left upper arm right where she got the shot basically"; ADMINISTRATION SITE INDENTATION (non-serious) with onset 29Jun2022, outcome "not recovered", described as "Dent in arm/located on left upper arm right where she got the shot basically". The events "dent in arm, darkened color, getting bigger/bruise looking thing is on her left upper arm/ located on left upper arm right where she got the shot basically", "dent in arm, darkened color, getting bigger/located on left upper arm right where she got the shot basically", "dent in arm/located on left upper arm right where she got the shot basically" and "tendonitis" required emergency room visit. The patient underwent the following laboratory tests and procedures: Ultrasound scan: (30Aug2022) no discrete mass, cyst or other fluid collection, notes: identified. No abnormalities in the area of concern. Therapeutic measures were taken as a result of tonsillectomy.  Clinical course: Patient has a "dent in arm, darkened color, getting bigger" after receiving booster of Pfizer Covid vaccine on 13Feb2022. She developed a dent in her arm and it started getting a little dark in color and now she has a significant dent and it's really dark. She had an ultrasound and the doctor doesn't know what to do in regards to this incident. States they need to know what to do to stop it, it's spreading bigger and is darker. She first started noticing the dent in her arm and it getting a little darker around 29Jun2022. The dent is the same but the color is a lot darker and getting bigger at the bottom of it. These are located on her left shoulder, the side of it. Clarifies left upper arm right where she got the shot basically. She thinks she was taking Wellbutrin as a concomitant drug. Dose she thinks was 250mg or 350mg. States she stopped taking it periodically like the end of May2022. Clarifies she thinks end of May2022 she stopped taking it due to having her tonsils removed end of May2022 and not being able to swallow medications. She restarted it probably like beginning of Jul2022 and then about 1 week ago she started weaning off it. Investigation: when she first went and it was brought to any doctor she went to Urgent Care and he thought tendonitis but didn't touch it and about a few weeks later she went to family doctor and she wanted to get Ultrasound of site where the bruise looking thing is on her left upper arm and no results from that. The results says it was a limited ultrasound of the left upper arm performed and no discrete mass, cyst or other fluid collection identified. No abnormalities in the area of concern.