her leg muscles, especially, her left leg muscles, started to deteriorate.; she can hardly walk; found the cyst in her leg and that it was really painful; real bad headaches; her memory is messed up; cyst was found in her left leg; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 70-year-old female patient received BNT162b2 (BNT162B2), on 28Sep2021 as dose 3 (booster), single (Batch/Lot number: unknown) at the age of 70 years, in right arm for covid-19 immunisation. The patient's relevant medical history included: "left leg injury" (unspecified if ongoing), notes: left leg injury years ago and had her knee cap taken out in 1975; "knee cap taken out" (unspecified if ongoing), notes: left leg injury years ago and had her knee cap taken out in 1975. There were no concomitant medications. Vaccination history included: BNT162b2 (1st Dose, Lot: E19269 (its bent on the paperwork, thinks lot E19269), Anatomical location: right arm), administration date: 12Feb2021, when the patient was 69-year-old, for COVID-19 Immunization, reaction(s): "diagnosed with covid"; BNT162b2 (2nd Dose, Lot: GNCR98 (hard to see handwriting, looks like a little r), Anatomical location: right arm), administration date: 04Mar2021, when the patient was 69-year-old, for COVID-19 Immunization, reaction(s): "diagnosed with covid", "Muscles started to deteriorate, especially in left leg". The following information was reported: CYST (non-serious) with onset 2022, outcome "not recovered", described as "cyst was found in her left leg"; MUSCLE ATROPHY (non-serious), outcome "not recovered", described as "her leg muscles, especially, her left leg muscles, started to deteriorate."; GAIT DISTURBANCE (non-serious), outcome "not recovered", described as "she can hardly walk"; PAIN IN EXTREMITY (non-serious), outcome "unknown", described as "found the cyst in her leg and that it was really painful"; HEADACHE (non-serious), outcome "unknown", described as "real bad headaches"; MEMORY IMPAIRMENT (non-serious), outcome "unknown", described as "her memory is messed up". Relevant laboratory tests and procedures are available in the appropriate section. Therapeutic measures were taken as a result of headache.  Additional information: She was a passenger at a drive-thru vaccination site for first and second dose and thinks the doses were administered in right arm. Booster dose was administered at withheld. She has plates and screws in left arm and cannot be injected into the left arm. Indication: She wanted to protect her mother that is 89 years old and 6 year old granddaughter that is autistic and to prevent COVID. Muscles started to deteriorate, especially in left leg: She knows this started after the second dose, and it started getting worse towards the booster time. Her left leg had been injured before and had knee cap removed, had physical therapy and that's why it showed up faster since they were keeping tabs her. Really painful cyst: discovered by touch right after the booster dose. Found it by doppler two and a half weeks ago and since her muscles have gone away it can really be felt there. She can hardly walk. Can hardly walk: Had trouble walking before the vaccines but now it is virtually impossible to walk, about 8 months ago this started and getting worse every day. Diagnosed with COVID: First week of Feb2022 Outcome: Hopes it has recovered They sent off her COVID test, clarifies they tested her after they sent an ambulance to her house and the supervisor took her test. Really bad headaches and memory messed up: Immediately after she had COVID , she has had a hard time with headaches and memory. Treatment: Her primary care , was prescribed some medication and read that it is for migraine headaches and she was never on anything before. It is scary. Is there a product complaint to report? Yes  The information on the batch/lot number for BNT162b2 has been requested and will be submitted if and when received.