The baby is always crying after the rash, usually related to the pain or somatic discomfort caused by the rash and other reasons, can be considered by chickenpox, toddler emergency rash and other diseases. 1. Chickenpox: caused by varicella zoster virus (VZV) infection, can first appear in the head and face red rash, can become papules, papules or blisters, gradually expanding, can be involved in the oral cavity, respiratory tract, etc., the child may have a headache, fever and other manifestations, at this time, the child due to discomfort or itchy skin lesions, there may be crying manifestations. 2. toddler rash: also known as infant rose rash, mostly through the air droplet transmission of human herpesvirus type 6 infection after the onset of high fever, fever for several days after the body temperature is about to be normal or return to normal when the rose-colored maculopapular rash, the child is not feeling well, and can be crying and screaming. When the baby has a rash manifestation, it is recommended to consult a doctor in time, and actively treat the cause and symptoms.