Is some cases, the affected child could develop generalized urticaria (generalized welts all over the body that are itchy). Also, there is a form of scabies called Norwegian scabies. This is a form of crusted scabies mainly seen in people with poor immunity (due to chemotherapy for cancer treatment, or AIDS) where the person has sometimes as much as 2 million mites alive on their skin at the same time (usually the number should be less than 100). There could also be secondary infection with staphylococcus or streptococcus bacteria.