: inflammation of the skin

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Dermatitis usually appears as a rash, and may cause itching, blisters, swelling, and often scabbing and scaling. It often marks an allergic reaction of some kind. Contact dermatitis is caused by something (often a chemical) touching the skin. Atopic dermatitis usually affects the insides of the elbows, the backs of the knees, and the face; generally resulting from an inherited sensitivity, it's often triggered by inhaling something. Eczema, psoriasis, and dandruff are all forms of dermatitis. Even in the worst cases, dermatitis isn't infectious and doesn't produce serious health consequences.

Examples of dermatitis in a Sentence

Recent Examples on the Web
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Lack of moisture, cold or dry environments, old age, and contact dermatitis can all trigger such a reaction. Bestreviews, Mercury News, 7 July 2026 Last year, another last-minute alteration was made at the Tour when stage 19 was shortened after an outbreak of contagious nodular dermatitis led to livestock being slaughtered on the original route. Jacob Whitehead, New York Times, 5 July 2026 For the summer itchiness of bug bites, poison ivy and other types of contact dermatitis, dermatologists recommend anti-itch balms such as hydrocortisone cream, calamine lotion or oatmeal baths. ABC News, 27 June 2026 It’s being tested in atopic dermatitis and, in combination with another experimental medicine, in asthma. Andrew Joseph, STAT, 22 June 2026 See All Example Sentences for dermatitis

Word History

First Known Use

1876, in the meaning defined above

Time Traveler
The first known use of dermatitis was in 1876

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Cite this Entry

“Dermatitis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/dermatitis. Accessed 14 Jul. 2026.

Kids Definition

dermatitis

noun
plural dermatitides -ˈtit-ə-ˌdēz How to pronounce dermatitis (audio) or dermatitises
: inflammation of the skin

Medical Definition

dermatitis

noun
plural dermatitises or dermatitides -ˈtit-ə-ˌdēz How to pronounce dermatitis (audio)
: inflammation of the skin

called also dermitis

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