Eczema herpeticum is a bad skin infection that occurs in people who already have eczema. The herpes virus (the same one that causes cold sores) invades the skin and causes painful red spots. The rash can spread very quickly over the body and needs to be treated quickly.
This is a companion discussion topic for the original article at https://patient.info/skin-conditions/atopic-eczema/eczema-herpeticum