After each of my original Moderna vaccines I had flu-like symptoms for several days but no skin manifestations.; red papule that changes into a flat scaly lesion; The sudden appearance of a very small itchy red papule that changes into a fl at scaly lesion that spreads locally and does not go away; Intermittent urticaria; About 36hrs post booster I developed an itchy rash on the back of both legs that was almost measles like.; measles-like erupti on that intermitt ently presents on my lower back, legs, back of my neck; This spontaneous case was reported by a physician and describes the occurrence of INFLUENZA LIKE ILLNESS (After each of my original Moderna vaccines I had flu-like symptoms for several days but no skin manifestations.), SKIN LESION (red papule that changes into a flat scaly lesion), PAPULE (The sudden appearance of a very small itchy red papule that changes into a fl at scaly lesion that spreads locally and does not go away), RASH PRURITIC (About 36hrs post booster I developed an itchy rash on the back of both legs that was almost measles like.) and RASH (measles-like erupti on that intermitt ently presents on my lower back, legs, back of my neck) in a  patient of an unknown age and gender who received mRNA-1273 (Moderna COVID-19 Vaccine) for COVID-19 prophylaxis. The occurrence of additional non-serious events is detailed below.     Patient had no history of childhood eczema or allergies.     On 11-Dec-2021, the patient received dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. In December 2021, the patient experienced RASH PRURITIC (About 36hrs post booster I developed an itchy rash on the back of both legs that was almost measles like.) and RASH (measles-like erupti on that intermitt ently presents on my lower back, legs, back of my neck). On an unknown date, the patient experienced INFLUENZA LIKE ILLNESS (After each of my original Moderna vaccines I had flu-like symptoms for several days but no skin manifestations.), SKIN LESION (red papule that changes into a flat scaly lesion), PAPULE (The sudden appearance of a very small itchy red papule that changes into a fl at scaly lesion that spreads locally and does not go away) and URTICARIA (Intermittent urticaria). The patient was treated with DIPHENHYDRAMINE at an unspecified dose and frequency and HYDROXYZINE at an unspecified dose and frequency. At the time of the report, INFLUENZA LIKE ILLNESS (After each of my original Moderna vaccines I had flu-like symptoms for several days but no skin manifestations.) had resolved, SKIN LESION (red papule that changes into a flat scaly lesion), PAPULE (The sudden appearance of a very small itchy red papule that changes into a fl at scaly lesion that spreads locally and does not go away), RASH PRURITIC (About 36hrs post booster I developed an itchy rash on the back of both legs that was almost measles like.) and RASH (measles-like erupti on that intermitt ently presents on my lower back, legs, back of my neck) had not resolved and URTICARIA (Intermittent urticaria) outcome was unknown.        For mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown), the reporter did not provide any causality assessments.   No concomitant medications were reported.  Patient was a retired pediatrician. No relevant concomitant medications were reported. Patient had 14 month long battle with what patient thought was Chronic spontaneous urticaria following a Moderna booster referring from a recent article Chronic spontaneous urticaria after COVID-19 primary vaccine series and boosters in the Case. Initially the rash had spread to lower back. Since then the rash had been with patient daily in different forms: a measles-like eruption which was always somewhere on body, very itchy, but varies in intensity. It may abate but was somewhere on body everyday. Patient had small itchy red papule that changes into a flat scaly lesion and had about 10 of these. They stop itching after 2-3 days but some of them continue to enlarge. Intermittent urticaria happens usually following showering or from pressure around waist after sitting to read or eat. Patient got some relief from diphenhydramine or hydroxyzine, which patient took at night to help sleep rather than scratch.