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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 ?
4a, the lowest point (valley) of the scratched profile is always below the original coating surface if there is no debonding.
The fact is, no matter how good at their job they are, nurses get scratched.
In the summer of 2003, an employee at a veterinary clinic in Kingston, Jamaica, was scratched and bitten on the hand by a cat.
A home with its windows scratched out; buildings collapsing; houses on fire; a street submerged in flood water; images of a family that slide in and out of focus are scratched, degraded and covered in cracks and fissures--in Louise Bourque's films, the world is an uncertain place and home is most definitely not a safe haven.
One car was scratched down to the bare metal causing pounds 500 damage.
have resumed sales of Microsoft Corp.'s Xbox video game consoles after a brief suspension resulting from massive customer complaints that the machines scratched game disks, officials of the two companies said Monday.
Q I HAVE recently sanded some window frames and accidentally scratched the glass.
Any card which has all the boxes scratched off is VOID and will not be eligible for any cash prize.
The worst affected areas in sufferers are always those that are most easily scratched or rubbed: the eyelids, under the ears, the forehead, the neck and wrists in adults and the joints in children.
Other flagship smartphones like the Samsung Galaxy S9, OnePlus 5T, IPhone X, and the iPhone 8 also scratched at the same Level 7, but the sapphire screen on the HTC U Ultra scratched at Level 8.