back broke up all over/back got worse and worse/in a horrible shape/cannot lay in their back; itching so bad; they can feel when another is about to blister up/starts like a grain of sand/then fluids come out/then starts to bleed; the arm hurt/could not lift anything with the right arm/it had no strength/unbearable pain; whole back burst up including shoulders and the top of their buttocks' but not their lower back; they could not lift anything with that arm, it had no strength; whole back burst up including shoulders and the top of their buttocks' but not their lower back; This spontaneous case was reported by a consumer and describes the occurrence of BACK PAIN (back broke up all over/back got worse and worse/in a horrible shape/cannot lay in their back), PRURITUS (itching so bad), BLISTER (they can feel when another is about to blister up/starts like a grain of sand/then fluids come out/then starts to bleed), PAIN IN EXTREMITY (the arm hurt/could not lift anything with the right arm/it had no strength/unbearable pain) and MUSCULOSKELETAL PAIN (whole back burst up including shoulders and the top of their buttocks' but not their lower back) in a 69-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 017B21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     No Medical History information was reported.   In March 2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 30-Mar-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On an unknown date, the patient experienced BACK PAIN (back broke up all over/back got worse and worse/in a horrible shape/cannot lay in their back), PRURITUS (itching so bad), BLISTER (they can feel when another is about to blister up/starts like a grain of sand/then fluids come out/then starts to bleed), PAIN IN EXTREMITY (the arm hurt/could not lift anything with the right arm/it had no strength/unbearable pain), MUSCULOSKELETAL PAIN (whole back burst up including shoulders and the top of their buttocks' but not their lower back), VACCINATION SITE MOVEMENT IMPAIRMENT (they could not lift anything with that arm, it had no strength) and ARTHRALGIA (whole back burst up including shoulders and the top of their buttocks' but not their lower back). The patient was treated with FOLIC ACID ongoing since an unknown date for Adverse event, at an unspecified dose and frequency; CLOBETASOL PROPIONATE ongoing since an unknown date for Adverse event, at a dose of USP, 0.05; AMMONIUM ACETATE ongoing since an unknown date for Adverse event, at an unspecified dose and frequency; TRIAMCINOLONE ongoing since an unknown date for Adverse event, at a dose of 1%; PRAMOCAINE HYDROCHLORIDE (CERAVE ITCH RELIEF) ongoing since an unknown date for Itching, at an unspecified dose and frequency and GABAPENTIN ongoing since an unknown date for Adverse event, at a dose of 300 milligram. At the time of the report, BACK PAIN (back broke up all over/back got worse and worse/in a horrible shape/cannot lay in their back), PRURITUS (itching so bad), BLISTER (they can feel when another is about to blister up/starts like a grain of sand/then fluids come out/then starts to bleed), PAIN IN EXTREMITY (the arm hurt/could not lift anything with the right arm/it had no strength/unbearable pain), MUSCULOSKELETAL PAIN (whole back burst up including shoulders and the top of their buttocks' but not their lower back), VACCINATION SITE MOVEMENT IMPAIRMENT (they could not lift anything with that arm, it had no strength) and ARTHRALGIA (whole back burst up including shoulders and the top of their buttocks' but not their lower back) outcome was unknown.            HCP took a biopsy from patient's back and the result showed it was pre cancerous.  No Concomitant Medications were provided by the reporter  Treatment Medications includes Pills   This case was linked to MOD-2021-406198 (Patient Link).