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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 ?
The appearance of the Nifty scratcher mimics a canoe, with a flat middle area and curved sides.
Determined Joyce then spotted the back scratcher her granddaughter had bought home as a present from a holiday in Benidorm, which she always keeps near her sofa.
And the scratchers more often had positive social interactions, rather than aggressive ones, after their scratches.
Big Lots, the lawsuit says, has been selling a cardboard scratcher with a fishbone on its sides from Pet Luv Products LLC of Peninsula, Ohio, that is "confusingly similar" to Cat Claws' product.
Minus 300 degrees, everything is freezing," said Scratcher.
They documented three instances where the monkeys used the scratcher tool.
Professor Scott Hoover got curious about the odds of his winning the $75,000 promised by the "scratcher" tickets he'd bought.
Manny Rothstein received a plastic two-handed back scratcher in the mail as a promotional giveaway from a drug company.
SHOCK 2: One US arts review website caused a storm after another concert when it referred to her violin as a "butt scratcher".
Like many young children, I am also a scratcher. I cannot stand having an itch and not nearly rubbing it raw.
"DJ Babu in Deep Concentration" finds the gifted scratcher weaving fragments of noise into a chattering symphony.