dermatographism

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dermatographism

 [der″mah-tog´rah-fizm]
urticaria due to physical allergy in which a pale, raised welt or wheal with a red flare on each side is elicited by stroking or scratching the skin with a dull instrument. adj., adj dermatograph´ic.

der·ma·tog·ra·phism

(der'mă-tog'ră-fizm),
A form of urticaria in which whealing occurs in the site and in the configuration of application of stroking (pressure, friction) of the skin. The resulting white line response appears early in flares of atopic dermatitis.
[dermato- + G. graphō, to write]

dermatographism

/der·ma·tog·ra·phism/ (der″mah-tog´rah-fizm) urticaria due to physical allergy, in which moderately firm stroking or scratching of the skin with a dull instrument produces a pale, raised welt or wheal, with a red flare on each side.dermatograph´ic
black dermatographism  black or greenish streaking of the skin caused by deposit of fine metallic particles abraded from jewelry by various dusting powders.
white dermatographism  linear blanching of (usually erythematous) skin of persons with atopic dermatitis in response to firm stroking with a blunt instrument.

dermatographism

Dermographism Dermatology A wheal-and-flare reaction evoked by firmly stroking the skin

der·ma·tog·ra·phism

(dĕ'-mă-tog'ră-fizm)
A form of urticaria in which whealing occurs in the site and in the configuration of application of stroking (pressure, friction) of the skin.
Synonym(s): dermographia, dermographism.
[dermato- + G. graphō, to write]

dermatographism

urticaria due to physical allergy in which a pale, raised welt or wheal with a red flare on each side is elicited by stroking or scratching the skin with a dull instrument.