Fluid filled blister , The pharmacist stated that the vaccine looks like it is trapped in the skin and not absorbing,caused a reaction with a large blister and fluid accumulation. gave the booster dose on the side of the arm and not in the middle of the deltoid muscle that caused a bubble and front of the body side and not in the middle of the deltoid; Fluid filled blister, The pharmacist stated that the vaccine looks like it is trapped in the skin and not absorbing,caused a reaction with a large blister and fluid accumulation.; Patient had reaction to the shot; gave the booster dose on the side of the arm and not in the middle of the deltoid muscle that caused a bubble and front of the body side and not in the middle of the deltoid; This spontaneous case was reported by a pharmacist and describes the occurrence of VACCINATION SITE VESICLES (Fluid filled blister , The pharmacist stated that the vaccine looks like it is trapped in the skin and not absorbing,caused a reaction with a large blister and fluid accumulation.), VACCINATION COMPLICATION (Patient had reaction to the shot), VACCINATION SITE VESICLES (gave the booster dose on the side of the arm and not in the middle of the deltoid muscle that caused a bubble and front of the body side and not in the middle of the deltoid), UNDERDOSE (Fluid filled blister , The pharmacist stated that the vaccine looks like it is trapped in the skin and not absorbing,caused a reaction with a large blister and fluid accumulation.) and INCORRECT ROUTE OF PRODUCT ADMINISTRATION (gave the booster dose on the side of the arm and not in the middle of the deltoid muscle that caused a bubble and front of the body side and not in the middle of the deltoid) in a 38-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) for COVID-19 vaccination.     No Medical History information was reported.    On 25-Oct-2021, the patient received third dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. In October 2021, the patient experienced VACCINATION SITE VESICLES (Fluid filled blister , The pharmacist stated that the vaccine looks like it is trapped in the skin and not absorbing,caused a reaction with a large blister and fluid accumulation.), VACCINATION COMPLICATION (Patient had reaction to the shot) and VACCINATION SITE VESICLES (gave the booster dose on the side of the arm and not in the middle of the deltoid muscle that caused a bubble and front of the body side and not in the middle of the deltoid). On 25-Oct-2021, the patient experienced UNDERDOSE (Fluid filled blister , The pharmacist stated that the vaccine looks like it is trapped in the skin and not absorbing,caused a reaction with a large blister and fluid accumulation.) and INCORRECT ROUTE OF PRODUCT ADMINISTRATION (gave the booster dose on the side of the arm and not in the middle of the deltoid muscle that caused a bubble and front of the body side and not in the middle of the deltoid). On 25-Oct-2021, UNDERDOSE (Fluid filled blister , The pharmacist stated that the vaccine looks like it is trapped in the skin and not absorbing,caused a reaction with a large blister and fluid accumulation.) and INCORRECT ROUTE OF PRODUCT ADMINISTRATION (gave the booster dose on the side of the arm and not in the middle of the deltoid muscle that caused a bubble and front of the body side and not in the middle of the deltoid) had resolved. At the time of the report, VACCINATION SITE VESICLES (Fluid filled blister , The pharmacist stated that the vaccine looks like it is trapped in the skin and not absorbing,caused a reaction with a large blister and fluid accumulation.), VACCINATION COMPLICATION (Patient had reaction to the shot) and VACCINATION SITE VESICLES (gave the booster dose on the side of the arm and not in the middle of the deltoid muscle that caused a bubble and front of the body side and not in the middle of the deltoid) outcome was unknown.        For mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown), the reporter did not provide any causality assessments.   No concomitant medication details was provided. No treatment medication details was provided.