This is the overarching category; irritant dermatitis is a subtype caused by direct toxic effect, distinguished from allergic contact dermatitis which is an immune-mediated reaction.
Atopic eczema is an endogenous condition driven by intense pruritus, whereas irritant dermatitis is an exogenous condition driven by exposure to a substance and is often more painful or burning than itchy.
This fungal infection may be inflammatory, but it is distinguished by an annular shape with a scaly border and a positive KOH test.
