Dermatitis means "inflammation of the skin." It looks like a red rash in most cases. It most often refers to eczema.
Dermatitis
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Eczema. See a full animation of this medical topic.
A patch of dermatitis that has been scratched
This is a foot in the advanced stages of dyshidrotic eczema otherwise known as pompholyx (pedophompholyx for when its found on the foot).