I started losing hair; This spontaneous case was reported by a patient and describes the occurrence of ALOPECIA (I started losing hair) in a male patient of an unknown age who received mRNA-1273.712 (SPIKEVAX 2024-2025 PFS) (batch no. 3043501) for COVID-19 prophylaxis. No Medical History information was reported. On 04-Nov-2024, the patient received dose of mRNA-1273.712 (SPIKEVAX 2024-2025 PFS) (Intramuscular use) 1 dosage form. In November 2024, the patient experienced ALOPECIA (I started losing hair). At the time of the report, ALOPECIA (I started losing hair) outcome was unknown. No concomitant medication was reported. Within 2 weeks after receiving vaccine patient started losing hair and it didn’t seem to be letting up. There was no change in his medicine, diet, or water intake. He did read that this was a rare side effect, and it should be improved in 3 to 6 months. No treatment medication was reported. Reporter did not allow further contact