After the second day of chickenpox vaccination, the needle is a little itchy, considering and adverse drug reactions, local allergies, local infections and other factors. 1. Adverse drug reactions: some children may have transient adverse reactions to varicella vaccine, such as local itching, most of which will get better soon and do not need special treatment. 2. Local allergy: some children may belong to the allergic body, for chickenpox vaccine in some components of the allergy, may produce local itching symptoms, may be due to contact with allergens and caused by the allergic reaction, so there will be itching symptoms. 3. Localized infection: if the child does not take good care of the injection site after chickenpox vaccination, infection may occur after touching water, which may cause itching or even pain. After the chickenpox vaccination the next day after the needle there is a little itchy situation, you should cooperate with the doctor as soon as possible to clarify the cause, and give targeted treatment and therapy.