Hives that look like big black and blue bruises; started experiencing hives, everything started in the arm where she received the vaccine, then it started in the other arm and after it expanded to the legs, Hives that look like big black and blue bruises; started experiencing hives, everything started in the arm where she received the vaccine, then it started in the other arm and after it expanded to the legs, Hives that look like big black and blue bruises; This spontaneous case was reported by a consumer and describes the occurrence of SKIN DISCOLOURATION (Hives that look like big black and blue bruises), VACCINATION SITE URTICARIA (started experiencing hives, everything started in the arm where she received the vaccine, then it started in the other arm and after it expanded to the legs, Hives that look like big black and blue bruises) and URTICARIA (started experiencing hives, everything started in the arm where she received the vaccine, then it started in the other arm and after it expanded to the legs, Hives that look like big black and blue bruises) in a 65-year-old female patient who received mRNA-1273 (Spikevax) for COVID-19 vaccination.     Concurrent medical conditions included Food allergy (many allergies to different foods.), Heart disorder and Thyroid disorder.    On an unknown date, the patient received second dose of mRNA-1273 (Spikevax) (unknown route) 1 dosage form. On an unknown date, the patient experienced SKIN DISCOLOURATION (Hives that look like big black and blue bruises), VACCINATION SITE URTICARIA (started experiencing hives, everything started in the arm where she received the vaccine, then it started in the other arm and after it expanded to the legs, Hives that look like big black and blue bruises) and URTICARIA (started experiencing hives, everything started in the arm where she received the vaccine, then it started in the other arm and after it expanded to the legs, Hives that look like big black and blue bruises). At the time of the report, SKIN DISCOLOURATION (Hives that look like big black and blue bruises), VACCINATION SITE URTICARIA (started experiencing hives, everything started in the arm where she received the vaccine, then it started in the other arm and after it expanded to the legs, Hives that look like big black and blue bruises) and URTICARIA (started experiencing hives, everything started in the arm where she received the vaccine, then it started in the other arm and after it expanded to the legs, Hives that look like big black and blue bruises) had not resolved.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On an unknown date, Biopsy: normal (normal) Normal. On an unknown date, Blood test: normal (normal) blood work did not show the hives were related to allergy..         Patient received medications for her heart and thyroid condition as Concomitant medication, however did not specifies on the medication.  Reporter stated that her sister received the first, second and the booster dose of the Moderna COVID-19 Vaccine and mentioned that she was not sure but she believed in between receiving the second and the booster dose her sister started experiencing hives, everything started in the arm where she received the vaccine, then it started in the other arm and after it expanded to the legs. She also referred that her sister was feeling very itchy and the hives looked like big bruises with the colors black and blue on the bruises and mentioned that her sister's symptoms have gotten worse. Her sister had visited different doctors and they have done biopsies. However nobody seems to know what was happening to her. The doctors also ran some blood tests because they thought these symptoms might be due to allergies. The blood work did not show the hives were related to allergy. Reporter also stated that her sister had many allergies to different foods, but she did not know if she had allergy to the medications. Reporter stated that her sister had never tested positive for COVID-19.  As treatment her sister had taken Antihistaminic and probably Corticoids. She explained that the symptoms got a little bit better with the medication but later came back.   This case was linked to MOD-2022-549089 (Patient Link).