B cells are a specific type of white blood cell called a lymphocyte. Other types of lymphocytes include T cells and natural killer cells. B cells develop from stem cells in bone marrow. They remain in the bone marrow until they become mature.
Infantile behavior is something the masses are taught to exemplify since childhood. As adults they (mostly Betas) are encouraged to have sexual relations with multiple partners.
In serious cases, the infection invades a deeper layer of skin and turns into a form of impetigo called ecthyma. When that happens, your child gets pus-filled bumps with a crust that's much darker and thicker than ordinary impetigo. Ecthyma can be very itchy. If your child scratches the irritated area, it can cause the infection to spread quickly.