Chickenpox is a skin disease that manifests itself through stages of red rash, blisters until the pustules burst and the chickenpox blisters crust over. This is an infectious disease, but many people wonder if chickenpox is still contagious when it crusts over.

Only apply methylene blue when the chickenpox blisters break. At this time, applying methylene blue directly to the broken blisters will shrink the blisters and prevent bacterial infection, disinfecting the blisters to dry quickly.