Hives; Red spots with a white border; Itchy; Hives was reported as worsened/ fast spreading; It's the worst on her elbows, forearms, knees, and calves; it's also behind her knees; it started on her thighs; Hurt very badly; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP and Physician). The reporter is the patient.  A 31 year-old female patient received bnt162b2 (BNT162B2), administered in arm left, administration date 06Oct2021 18:00 (Batch/Lot number: unknown) at the age of 31 years as dose 1, single for covid-19 immunisation. Relevant medical history included: "Gestational diabetes" (unspecified if ongoing), notes: baby on 07Jun2021, and have gestational diabetes, which stopped after she had the baby.; "Possible gluten allergy" (unspecified if ongoing). There were no concomitant medications. The following information was reported: URTICARIA (non-serious) with onset 07Oct2021, outcome "not recovered", described as "Hives"; RASH MACULAR (non-serious) with onset 2021, outcome "unknown", described as "Red spots with a white border"; PRURITUS (non-serious) with onset 2021, outcome "unknown", described as "Itchy"; CONDITION AGGRAVATED (non-serious) with onset 2021, outcome "unknown", described as "Hives was reported as worsened/ fast spreading; It's the worst on her elbows, forearms, knees, and calves; it's also behind her knees; it started on her thighs"; PAIN (non-serious) with onset 2021, outcome "unknown", described as "Hurt very badly". The event "hives" was evaluated at the physician office visit. Relevant laboratory tests and procedures are available in the appropriate section. Therapeutic measures were taken as a result of urticaria, rash macular, pruritus, condition aggravated.  Additional Information: A few days after receiving her first dose patient developing a rash that got progressively worse over the following weeks. States that she received her 1st dose on 06Oct2021. Since 07Oct2021, she has been struggling with a dermatological reaction. She has been to a Dermatologist 3 times so far, and even went to her Primary care doctor first, who did blood work to try to figure out what is going on. The Dermatologist told her that they have few facts and not a lot of published studies on dermatology reactions related to the vaccine, so she can't come up with a diagnosis, which is effecting the way her insurance is covering it. Caller states the issue she is having is like hives, or at least that is what they are calling them. They are red spots with a white border. There's no pus in them. She had a biopsy done and that ruled out psoriasis. States that it's fast spreading; some are singular, and some are in patches. It's the worst on her elbows, forearms, knees, and calves; it's also behind her knees; it started on her thighs. She doesn't have any on her face, chest, or stomach. It's currently being treated with a topical steroid, Clobetasol propionate 0.05%, applied twice a day and whenever a new spot pops up. States that when they first pop up they are extremely itchy, white and pale pink. When they mature, which is between 24-48 hours after popping up, they become darker and they hurt very badly. Caller is asking for any assistance possible because her insurance is not covering the Dermatology visits because they don't have a code to use since she doesn't have a diagnosis. Weight: States that she is still working on getting rid of the baby weight. Caller did give consent to contact him, but states that all he did was blood work and then referred her to a Dermatologist. If more information is needed from a physician, caller requests that the Dermatologist be contacted. States that the hives are getting way worse everyday. States that her 1st visit to the Dermatologist was on 8Oct or 9Oct, it was considered an emergency dermatology appointment because when she called she was told that if she went to the ER they would only send her to a dermatologist. So her 1st appointment with the Dermatologist was early in the morning outside of office hours, which is where the problem is with the insurance because there is no real code to use for the insurance and they aren't wanting to pay. She had a biopsy done on 13Oct2021. The preliminary infectious disease result, psoriasis, shingles were all negative. States that she is expecting a call from the Dermatologist today. The doctor sent her a text yesterday stating that she needed to speak with a Derma-pathologist, and that the hives were likely vaccine related. The doctor said that she should hold off on the 2nd dose of the vaccine. The text further said that her immune is reacting to the vaccine, but this reaction should not land her in ER. Recommended that she also try taking Zyrtec twice a day, which caller states she has not tried yet.  Follow-up attempts are completed. Information about lot/batch number cannot been obtained. No further information is expected.