Chickenpox-like rash (usually 5 red bumps) scattered over the body (4%) This mild rash begins 5 to 26 days after the shot. Most often, it lasts a few days.Click to see full answer. Considering this, how long after a vaccine can side effects occur?These reactions typically occur within a day or two of immunization (except for rash reactions after measles vaccine, which can arise up to 6 to 12 days after immunization) and persist from one to a few days.Furthermore, what is the side effect of varicella vaccine? The most commonly reported side effects after vaccination are soreness or swelling where the shot was given, fever, and mild rash. Very rare side effects include seizures and pneumonia. Before the FDA licensed the vaccine, studies were done to determine the safety of 2 doses of the vaccine. Likewise, people ask, does varicella vaccine make you sick? The most common side effect from the chickenpox vaccine is swelling, soreness, or redness at the site of the injection. A small number of people may also develop a mild rash or a low-grade fever after vaccination. Serious reactions to the chickenpox vaccine are extremely rare, but they may include: Seizures.How long does varicella vaccine rash last?The fever and rash usually occurred 5 to 12 days after MMRV or MMR and varicella vaccination and resolved quickly without long-term problems.