Plural of dermatitis; multiple instances or types of skin inflammation with itching and redness.
From Greek 'derma' (skin) and '-itis' (inflammation), with regular English plural '-es'. The term has been in medical use since the late 18th century to describe inflammatory skin conditions.
There are dozens of different dermatitises—contact dermatitis, atopic dermatitis, seborrheic dermatitis—and they all share redness and itching but have different causes.
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