Most cases of chickenpox are self-limiting and do not lead to significant complications with sequelae. It is only when chickenpox is particularly severe leading to complications that sequelae may occur. In the case of chickenpox encephalitis, brain damage is severe and can lead to death, while if survived there is a risk of sequelae of mental abnormalities, mental retardation, and seizures. In case of chickenpox pneumonia, there is a risk of manifestation of secondary bacterial infection in the lungs, which can lead to death in severe cases, while if survived there is a risk of shadow found on lung x-ray, which usually does not affect respiratory function if the area is not large. If you get chickenpox within 20 weeks of pregnancy, it may cause congenital chickenpox syndrome in the child, and the child may be born with various deformities of the limbs, and in serious cases, it may lead to stillbirth.