Uncomfortable; neck is sore on both sides & bothers him a lot,It feels like it is going into his left shoulder; Arthritis/ hears a popping sound in the right shoulder socket; Muscle atrophy in the right arm as there is a depression in the muscle; Pain is now in the shoulder & upper arm & from mid forearm to wrist; Rash was itching; Moderna arm; This spontaneous case was reported by a consumer and describes the occurrence of ARTHRITIS (Arthritis/ hears a popping sound in the right shoulder socket), MUSCLE ATROPHY (Muscle atrophy in the right arm as there is a depression in the muscle), VACCINATION COMPLICATION (Moderna arm), PAIN IN EXTREMITY (Pain is now in the shoulder & upper arm & from mid forearm to wrist) and RASH PRURITIC (Rash was itching) in a 79-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 029K20A and 026L20A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     The patient's past medical history included Detached retina. Concurrent medical conditions included Diabetic and Neuropathy peripheral (Neuropathy in feet).   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 25-Feb-2021, the patient experienced VACCINATION COMPLICATION (Moderna arm) and RASH PRURITIC (Rash was itching). In August 2021, the patient experienced ARTHRITIS (Arthritis/ hears a popping sound in the right shoulder socket), MUSCLE ATROPHY (Muscle atrophy in the right arm as there is a depression in the muscle), PAIN IN EXTREMITY (Pain is now in the shoulder & upper arm & from mid forearm to wrist) and NECK PAIN (neck is sore on both sides & bothers him a lot,It feels like it is going into his left shoulder). On an unknown date, the patient experienced DISCOMFORT (Uncomfortable). The patient was treated with PARACETAMOL (TYLENOL [PARACETAMOL]) for Pain, at an unspecified dose and frequency. At the time of the report, ARTHRITIS (Arthritis/ hears a popping sound in the right shoulder socket), MUSCLE ATROPHY (Muscle atrophy in the right arm as there is a depression in the muscle), VACCINATION COMPLICATION (Moderna arm), PAIN IN EXTREMITY (Pain is now in the shoulder & upper arm & from mid forearm to wrist) and NECK PAIN (neck is sore on both sides & bothers him a lot,It feels like it is going into his left shoulder) outcome was unknown and RASH PRURITIC (Rash was itching) and DISCOMFORT (Uncomfortable) had resolved.            Concomitant product use was not provided by the reporter.  Patient received Antibiotic cream for treatment medication.  A week after the second dose, patient  got a rash between the injection site and elbow that went away after 10 days of antibiotic cream use. He said the rash was bumpy, itching, and uncomfortable. From about April to August he was doing fine.; Sender's Comments: This spontaneous case concerns a 79-year-old male patient with relevant medical history of diabetes mellitus and neuropathy peripheral, who experienced non-serious unexpected event of special interest (AESI) muscle atrophy. The event occurred 6 months after the second dose of the Moderna COVID-19 Vaccine (mRNA-1273). Rechallenge was not applicable since the event occurred after the second dose so, no rechallenge was done and recurrence was not applicable. Patient's history of peripheral neuropathy and diabetes mellitus provide alternative explanation for development of the reported event and are possible confounders. The benefit-risk relationship of drug is not affected by this report.