Lexicon for Atopic Dermatitis

This is a lexicon for Atopic Dermatitis.
Click on a letter and discover all the related terms and their definition.

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  • Ultraviolet

     

    Part of the electromagnetic spectrum just below visible light. Ultraviolet waves have significant biological actions. They are: 
    - UVB, with a wavelength between 280 and 320nm. These are primarily responsible for sun burn (acute phototoxicity).
    - UVA, with a wavelength between 320 and 400nm. They do not burn, but are responsible for photosensitivity. 
    This distinction is useful in fundamental photobiology, and for certain treatments using ultraviolet light (phototherapy). In practice one should protect oneself from all kinds of UV in order to avoid skin aging and cancer in the long term. This is the role of currently-available photoprotection products. 
     
  • Urea

     

    A small molecule that is naturally derived from protein metabolism. Urea is part of epidermal NMF. It is used in dermo-cosmetics. In low concentrations it is hydrating. In higher concentrations it is keratolytic and irritant.  
     
  • Urticaria

     

    Comes from the Latin 'urtica' meaning nettle. Urticaria is a common skin reaction that appears as papules or raised red areas of various sizes. They are very itchy. They are temporary, lasting only a few hours, although they reappear elsewhere. It is important to determine the cause of urticaria lesions. It could be due to a drug, a food, or another cause. Whilst urticaria involves similar immunological mechanisms to those involved in atopic conditions, it is not very common in atopic patients.
     
     
  • UVA

     

    See Ultraviolet.
     
     
  • UVB

     

    See Ultraviolet.
     
     
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