Infectious skin rash
Both children and adults can become infected with systemic diseases like chickenpox, measles, and others. They are not common in adults, and they are usually more severe and worrying as we grow older. Other infectious causes include ringworm and other infections of the skin. Each one of them displays characteristics we have discussed above, and the severity of the condition depends on the cause.
As you can probably guess by reading this short list, some types of rash in adults are not to be classified in one single type. You can have an infectious and inflammatory rash or an allergic skin rash with infectious symptoms due to itching and scratching. Thus, after determining the type of skin rash, we should also think about the probable cause.