arm started turning red, swelling, became warm to the touch and was hard; vaccination site infection; arm started turning red, swelling, became warm to the touch and was hard; arm started turning red, swelling, became warm to the touch and was hard; arm started turning red, swelling, became warm to the touch and was hard; a "little tenderness in my arm and it was a little stiff"; a "little tenderness in my arm and it was a little stiff"; This spontaneous case was reported by a consumer (subsequently medically confirmed) and describes the occurrence of MUSCULOSKELETAL STIFFNESS (a "little tenderness in my arm and it was a little stiff"), VACCINATION SITE WARMTH (arm started turning red, swelling, became warm to the touch and was hard), VACCINATION SITE INFECTION (vaccination site infection), VACCINATION SITE INDURATION (arm started turning red, swelling, became warm to the touch and was hard) and VACCINATION SITE PAIN (a "little tenderness in my arm and it was a little stiff") in a 68-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 011J20A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     The patient's past medical history included No adverse event (No medical history reported.).    On 05-Jan-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 05-Jan-2021, the patient experienced MUSCULOSKELETAL STIFFNESS (a "little tenderness in my arm and it was a little stiff") and VACCINATION SITE PAIN (a "little tenderness in my arm and it was a little stiff"). On 11-Jan-2021, the patient experienced VACCINATION SITE WARMTH (arm started turning red, swelling, became warm to the touch and was hard), VACCINATION SITE INFECTION (vaccination site infection), VACCINATION SITE INDURATION (arm started turning red, swelling, became warm to the touch and was hard), VACCINATION SITE ERYTHEMA (arm started turning red, swelling, became warm to the touch and was hard) and VACCINATION SITE SWELLING (arm started turning red, swelling, became warm to the touch and was hard). The patient was treated with PARACETAMOL (TYLENOL) at an unspecified dose and frequency and PREDNISONE at an unspecified dose and frequency. On 06-Jan-2021, MUSCULOSKELETAL STIFFNESS (a "little tenderness in my arm and it was a little stiff") and VACCINATION SITE PAIN (a "little tenderness in my arm and it was a little stiff") had resolved. At the time of the report, VACCINATION SITE WARMTH (arm started turning red, swelling, became warm to the touch and was hard), VACCINATION SITE INFECTION (vaccination site infection), VACCINATION SITE INDURATION (arm started turning red, swelling, became warm to the touch and was hard), VACCINATION SITE ERYTHEMA (arm started turning red, swelling, became warm to the touch and was hard) and VACCINATION SITE SWELLING (arm started turning red, swelling, became warm to the touch and was hard) outcome was unknown.        The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown) was unknown.       Concomitant product use was not provided by the reporter.     Treatment medications also include Antibiotics,calamine lotion.; Sender's Comments: Based on current available information and temporal association between the use of the product and the start date of the events, a causal relationship cannot be excluded