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(skrach) [ME. cracchen, to scratch]
1. A mark or superficial injury produced by scraping with the nails on a rough surface.
2. To make a thin, shallow cut with a sharp instrument.
3. To rub the skin, esp. with the fingernails, to relieve itching. Scratching temporarily relieves itching by soothing the cutaneous nerves, but in the long run, it may worsen the condition that caused the itching. See: pruritus
Medical Dictionary, © 2009 Farlex and Partners

Patient discussion about scratch

Q. why do allergy effects comes usually in sorts of sneezing and scratching and more other thing like that?

A. It's because the substances released in the allergic reaction of the immune system to the allergen, like histamine, cause sensation of itching. They also cause increased secretion of mucus from the lining of the throat, which irritates the airway and cause sneezing.

You may read more here:

Q. Is there any information out there regarding a severe allergy to cat scratches? Is there any information out there regarding a severe allergy to cat scratches? I am not referring to "cat scratch fever" disease, but an allergy where the site of the scratch becomes swollen and red, and the person has hives and trouble breathing. Thanks so much!

A. Greetings Humble Earthling! It sounds like you have two or more things going on. First, cat scratch fever is caused by a parasite and comes on 1 to 2 weeks after the scratch. Allergic reactions are immediate.
Now, if the site of the scratch is swollen and red, that could be due to minor infection and just the process of healing.

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References in periodicals archive ?
James said: "I was pleased to be asked by Collective//Pod to contribute to the Scratch the Surface event, initially by providing some of my brother's paintings and more recently by participating at the opening, talking and answering questions about Bryan Charnley's work as well as I can.
Equal parts classic SOIA-style hardcore brutality and political invective aimed directly at the Bush Administration's--in Koller's estimation--lack of integrity, the new record finds the group achieving its most frenetic release since Scratch the Surface.
Scratch the surface of many audit plans and you'll find predictable elements that someone bent on fraud can anticipate and foil.
But the two of them are just beginning to scratch the surface of a lethal conspiracy between greedy corporate executives, the Russian Mafia, and Afghani terrorists.
Only time will tell, but I believe Coney Island has only begun to scratch the surface.
"We're just starting to scratch the surface. The good news is we have a structure, [with] several pilot [programs] to expand it.
Russell says he and his colleagues have only begun to scratch the surface with their work on the functions of molecular machines.
And these examples only scratch the surface of a disturbing subculture ruled by out-of-control peer pressure and the lust for prestige.