Verywell Health: What are some clues that dry skin might actually be atopic dermatitis?
Dr. Singh: Itch is the hallmark ofatopic dermatitis.
It is often called the itch that rashes, rather than a rash that itches.

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They are unique conditions unto themselves.
Atopic Dermatitis or Eczema?
The terms “atopic dermatitis” and “eczema” are sometimes used interchangeably.
Most people use the word “eczema” for the skin condition.