This spontaneous case was reported by a patient and describes the occurrence of CONTUSION (Next day there was a big bruise black, blue and green, from her arm until her waist and almost her breast), SKIN DISCOLOURATION (Next day there was a big bruise black, blue and green), PERIPHERAL SWELLING (the area is just a bit swollen), PAIN (it was sore/sore bruise) and AXILLARY MASS (Her arm pit was tremendously swollen) in a 66-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 038A22A, 022C21A, 030A21A and 007M20A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below. It was reported as patient never had COVID positive test or diagnosis and it was reported as unknown if patient took other vaccines given within one month prior to Moderna COVID-19 vaccine. Concurrent medical conditions included Allergy to antibiotic (Patient is allergic to cephalosporines), Iodine allergy (Patient is allergic to IV Contrast) and Migraine. Concomitant products included GABAPENTIN for Migraine, ATORVASTATIN CALCIUM (LIPITOR) and ASPIRIN [ACETYLSALICYLIC ACID] for an unknown indication. On 02-Feb-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 04-Mar-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 10-Nov-2021, received third dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 02-Jun-2022, received fourth dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 02-Jun-2022, after starting mRNA-1273 (Moderna COVID-19 Vaccine), the patient experienced PRODUCT ADMINISTERED AT INAPPROPRIATE SITE (Patient thought maybe HCP did not administered the vaccine in the correct injection route, maybe it was administered in a blood vessel). On 03-Jun-2022, the patient experienced AXILLARY MASS (Her arm pit was tremendously swollen), FATIGUE (She felt tired) and MYALGIA (Body aches). On 04-Jun-2022, the patient experienced CONTUSION (Next day there was a big bruise black, blue and green, from her arm until her waist and almost her breast), SKIN DISCOLOURATION (Next day there was a big bruise black, blue and green) and PAIN (it was sore/sore bruise). On 07-Jun-2022, the patient experienced PERIPHERAL SWELLING (the area is just a bit swollen). On 03-Jun-2022, FATIGUE (She felt tired) and MYALGIA (Body aches) had resolved. On 06-Jun-2022, AXILLARY MASS (Her arm pit was tremendously swollen) had resolved. At the time of the report, CONTUSION (Next day there was a big bruise black, blue and green, from her arm until her waist and almost her breast) and SKIN DISCOLOURATION (Next day there was a big bruise black, blue and green) had not resolved and PERIPHERAL SWELLING (the area is just a bit swollen), PAIN (it was sore/sore bruise) and PRODUCT ADMINISTERED AT INAPPROPRIATE SITE (Patient thought maybe HCP did not administered the vaccine in the correct injection route, maybe it was administered in a blood vessel.) outcome was unknown. Patient went to ER on 06-Jun-2022. No treatment medication were given. This case was linked to MOD-2022-584152, MOD-2022-584154, MOD-2022-584155 (Patient Link).