Cellulitis; Trouble Breathing; chest discomfort; allergic reaction; covid arm/ allaergic reaction; Right arm of injection warm to touch/ warm to touch; Right arm of injection red/ redness; Right arm of injection swollen/ swelling at injection site (golf ball size) /more swelling; soreness in arm; This spontaneous case was reported by a consumer and describes the occurrence of DYSPNOEA (Trouble Breathing), CHEST DISCOMFORT (chest discomfort) and CELLULITIS (Cellulitis) in a 68-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 039K20A) 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.). Concomitant products included MULTIVITAMINS [VITAMINS NOS] and CALCIUM CARBONATE, VITAMIN D NOS (CALCIUM + VIT D).    On 05-Jan-2021 at 1:30 PM, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 05-Jan-2021, the patient experienced VACCINATION SITE PAIN (soreness in arm). On 06-Jan-2021, the patient experienced INJECTION SITE WARMTH (Right arm of injection warm to touch/ warm to touch), INJECTION SITE ERYTHEMA (Right arm of injection red/ redness) and INJECTION SITE SWELLING (Right arm of injection swollen/ swelling at injection site (golf ball size) /more swelling). On 08-Jan-2021, the patient experienced VACCINATION SITE REACTION (covid arm/ allaergic reaction). On 13-Jan-2021, the patient experienced DYSPNOEA (Trouble Breathing) (seriousness criterion hospitalization), CHEST DISCOMFORT (chest discomfort) (seriousness criterion hospitalization) and HYPERSENSITIVITY (allergic reaction). On 14-Jan-2021, the patient experienced CELLULITIS (Cellulitis) (seriousness criterion hospitalization). The patient was hospitalized from 13-Jan-2021 to 14-Jan-2021 due to CELLULITIS, CHEST DISCOMFORT and DYSPNOEA. On 18-Feb-2021, DYSPNOEA (Trouble Breathing), CHEST DISCOMFORT (chest discomfort), CELLULITIS (Cellulitis), VACCINATION SITE REACTION (covid arm/ allaergic reaction), HYPERSENSITIVITY (allergic reaction), INJECTION SITE WARMTH (Right arm of injection warm to touch/ warm to touch), VACCINATION SITE PAIN (soreness in arm), INJECTION SITE ERYTHEMA (Right arm of injection red/ redness) and INJECTION SITE SWELLING (Right arm of injection swollen/ swelling at injection site (golf ball size) /more swelling) had resolved.        mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) dosing remained unchanged.       On 07 Jan 2021, the patient began using cold pack, cortisone cream and Benadryl. Treatment was discontinued on 11 Jan 2021. However redness and swelling returned worse than before on 13 Jan 2021. On 13 Jan 2021, patient was prescribed steroid dose pack and cream. On 14 Jan 2021, patient began antibiotics.   Most recent FOLLOW-UP information incorporated above includes: On 14-Apr-2021: Patient's concomitant medications updated; height and weight provided; vaccination dosing details provided; treatment details provided; event details provided; Sender's Comments: Based on the current available information and temporal association between the use of the product and the start dates of the events, a causal relationship cannot be excluded.