Hypersensitivity reaction; Upper arm, just below shoulder, felt itchy like a bad mosquito bite/ it was still itching while I was lying down trying to sleep/ Localised itching/Arm itched as I tried to fall asleep, and I woke up scratching; It was somewhat red, Localised redness/erythema/ upper part of my left arm was bright red; In the morning, it had become swollen; Rash is a lilltle bit achy; Rash at injection site about 2 inches in diameter; Delayed itchy rash; Sore arm that was hard to raise/there was also some pain that accompanied the itching when I pressed on my arm; This spontaneous case was reported by a consumer and describes the occurrence of PAIN IN EXTREMITY (Sore arm that was hard to raise/there was also some pain that accompanied the itching when I pressed on my arm), RASH PRURITIC (Delayed itchy rash), HYPERSENSITIVITY (Hypersensitivity reaction), PRURITUS (Upper arm, just below shoulder, felt itchy like a bad mosquito bite/ it was still itching while I was lying down trying to sleep/ Localised itching/Arm itched as I tried to fall asleep, and I woke up scratching) and ERYTHEMA (It was somewhat red, Localised redness/erythema/ upper part of my left arm was bright red) in a 24-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 014M20A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     The patient's past medical history included Allergy to plants (Patient had nausea "spacey" feeling  she did not feel like she was in her own body, felt floaty.She stated that she drank tea with fresh sage and the symptom got worse as she drank more and went away when she stopped drinking.) on 20-Nov-2015. Previously administered products included for Product used for unknown indication: Flu vaccine (Patient immediately started blacking out and had to lay down.) in 2009. Past adverse reactions to the above products included Blackout with Flu vaccine. Concurrent medical conditions included Hay fever. Concomitant products included LORATADINE from 09-Jan-2020 to an unknown date for Allergy.    On 26-Feb-2021 at 10:55 AM, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 26-Feb-2021, the patient experienced PAIN IN EXTREMITY (Sore arm that was hard to raise/there was also some pain that accompanied the itching when I pressed on my arm). On 02-Mar-2021, the patient experienced RASH PRURITIC (Delayed itchy rash), RASH (Rash is a lilltle bit achy) and VACCINATION SITE RASH (Rash at injection site about 2 inches in diameter). On 04-Mar-2021, the patient experienced PRURITUS (Upper arm, just below shoulder, felt itchy like a bad mosquito bite/ it was still itching while I was lying down trying to sleep/ Localised itching/Arm itched as I tried to fall asleep, and I woke up scratching), ERYTHEMA (It was somewhat red, Localised redness/erythema/ upper part of my left arm was bright red) and PERIPHERAL SWELLING (In the morning, it had become swollen). On 04-Mar-2021 at 10:00 AM, the patient experienced HYPERSENSITIVITY (Hypersensitivity reaction). On 06-Mar-2021, PAIN IN EXTREMITY (Sore arm that was hard to raise/there was also some pain that accompanied the itching when I pressed on my arm), RASH PRURITIC (Delayed itchy rash), PRURITUS (Upper arm, just below shoulder, felt itchy like a bad mosquito bite/ it was still itching while I was lying down trying to sleep/ Localised itching/Arm itched as I tried to fall asleep, and I woke up scratching), ERYTHEMA (It was somewhat red, Localised redness/erythema/ upper part of my left arm was bright red), PERIPHERAL SWELLING (In the morning, it had become swollen), RASH (Rash is a lilltle bit achy) and VACCINATION SITE RASH (Rash at injection site about 2 inches in diameter) had resolved. On 06-Mar-2021 at 8:00 AM, HYPERSENSITIVITY (Hypersensitivity reaction) had resolved.        The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) was unknown.       Treatment information was not provided.  The patient stated that she took second dose of Moderna on 26-Mar-2021 with batch no. 047A21A in her left arm.   Most recent FOLLOW-UP information incorporated above includes: On 19-Jul-2021: Follow-up received on 19-Jul-2021 contains significant information. The Primary reporter contact details updated. The patient demographics updated. The medical history information was added. The concomitant was added. New events were added. The event outcome was changed from unknown to recovered/resolved.