Redness of the entire arm from shoulder to elbow/arm started getting red; hardly can move her arm; arm started getting swollen; arm was turning balck-bue from  shoulder to elbow; Arm hurt/Arm  still very painful; This spontaneous case was reported by a consumer and describes the occurrence of ERYTHEMA (Redness of the entire arm from shoulder to elbow/arm started getting red), MOBILITY DECREASED (hardly can move her arm), PERIPHERAL SWELLING (arm started getting swollen), SKIN DISCOLOURATION (arm was turning balck-bue from  shoulder to elbow) and PAIN IN EXTREMITY (Arm hurt/Arm  still very painful) in a 79-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 066K21A, 062E21B, 031L20A and 029L20A) for COVID-19 vaccination.     Concomitant products included THYROID (ARMOUR THYROID) for an unknown indication.   On 21-Jan-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 18-Feb-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 23-Aug-2021, received third dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 07-Apr-2022, received fourth dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 07-Apr-2022, the patient experienced PAIN IN EXTREMITY (Arm hurt/Arm  still very painful). On 10-Apr-2022, the patient experienced SKIN DISCOLOURATION (arm was turning balck-bue from  shoulder to elbow). On an unknown date, the patient experienced ERYTHEMA (Redness of the entire arm from shoulder to elbow/arm started getting red), MOBILITY DECREASED (hardly can move her arm) and PERIPHERAL SWELLING (arm started getting swollen). At the time of the report, ERYTHEMA (Redness of the entire arm from shoulder to elbow/arm started getting red), MOBILITY DECREASED (hardly can move her arm), PERIPHERAL SWELLING (arm started getting swollen), SKIN DISCOLOURATION (arm was turning balck-bue from  shoulder to elbow) and PAIN IN EXTREMITY (Arm hurt/Arm  still very painful) had not resolved.      Patient wanted to report a serious reaction after second booster dose, stated that was not an anti-vaccine but needed a solution on this. Patient just went out for Urgent care for redness of the entire arm from shoulder to elbow, not red it's black and blue. Patient stated was not allergic, never tested positive for Covid-19, did not have any vaccine in between 1 month near booster.Patient did not have any reaction on previous doses of the Moderna Covid-19 Vaccine but after the second booster dose. Patient arm started getting red and swollen, patient used a cool pad on it, and that help patient to felt good. Patient went to urgent care as they mention it was a biggest reaction to the vaccine and they say was not cellulitis. Patient stated was getting worst and was very concerned. Patient requested to speak with a doctor requested for a solution, asked if blood test was needed. Patient mention that vaccine provider was very negligent, did not change globes in between patients, globes were dirty, did not wash her hands.   This case was linked to MOD-2022-538039 (Patient Link).