Itchy all over my body/ My neck was so itchy; My skin felt like it was on fire; Burning and itchiness; Had hives all over my body; Mysterious rash with red bumps.It appeared on my thighs, calves, arms, chest, face, neck, and stomach; Petichae bruises /bruises on my body and other mysterious bruise; Severe allergic reaction; It also gave me my period which I haven't had in a year due to PCOSThis occurred for around 2-3 weeks.; This is a spontaneous report from a non-contactable consumer or other non hcp (patient). A 20-years-old non-pregnant female patient received bnt162b2 (Formulation: Solution for injection, Batch/Lot Number: ew0185), via an unspecified route of administration, administered in Arm Left on 21May2021 12:15 (at the age of 20-years-old) as 1ST DOSE, SINGLE for covid-19 immunisation. Medical history included Polycystic Ovarian Syndrome. Concomitant medication included amitriptyline. On 24May 2021 the patient experienced itchy all over her body/ her neck was so itchy, her skin felt like it was on fire, burning and itchiness, had hives all over her body, mysterious rash with red bumps.it appeared on her thighs, calves, arms, chest, face, neck, and stomach. On an unspecified date in May2021,  the patient experienced petichae bruises /bruises on her body and other mysterious bruise, severe allergic reaction and it also gave her  period which she haven't had in a year due to PCOS this occurred for around 2-3 weeks. The patient reported that 3 days after first vaccination she started to get itchy all over body her skin felt like it was on fire and she laid in bed with ice cubes on it. Cold showers helped to ease the burning and itchiness. She had hives all over her body and a mysterious rash with red bumps. It appeared on her thighs, calves, arms, chest, face, neck, and stomach, her neck was so itchy that she accidentally scratched off a birth mark. The doctor told her to take Benadryl and applied Benadryl cream both of which did not help. She ended up at the ER where she was prescribed me 40 mg of Prednisone to take for 5 days. The rash went away as soon as she took the meds. A few days after that she got Petichae bruises on body and other mysterious bruises. She went in to see her primary care doctor who told that she had a severe allergic reaction and that it's unsafe for her to get second dose. She also got her period which she haven't had in a year due to PCOS. This occurred for around 2-3 weeks. Therapeutic measures were taken as a result of itchy all over my body/ my neck was so itchy, my skin felt like it was on fire, burning and itchiness, had hives all over my body, mysterious rash with red bumps.it appeared on my thighs, calves, arms, chest, face, neck, and stomach. The events were considered as serious (medically significant). The outcome of the events patient experienced itchy all over my body/ my neck was so itchy, my skin felt like it was on fire, burning and itchiness, had hives all over my body was resolving, for the event mysterious rash with red bumps.it appeared on my thighs, calves, arms, chest, face, neck, and stomach the outcome was resolved on May2021, for rest of the events the outcome was unknown. No follow-up attempts are possible. No further information is expected.