My Daughters skin

My daughter has been experiencing a skin irritation issue.  If she or an object scratches the surface of her skin, it swells.  We could be in a store and if a clothing tag rubs/scratches her skin it will swell.  It swells to the height of a mosquito bite and this welt is now the length of the scratch and it become red.   Weather, temperature the type of object doesn’t seem to matter.  Her skin will react to it.  I thought that she would have grown out of it, she is 7, but it has been occurring for the past 3-4 years and it seem to be getting worse.  Is there a name for this?  

[Dr_Aparna]

Hi,
Hives are red, itchy welts or swellings on the skin that often come in clusters.In doctor speak, hives are known as "urticaria."Hives can appear anywhere on the body, cropping up either in one small area or covering large patches of skin. They most often occur as part of an allergic reaction.
Hives are often caused by a hypersensitivity to:
•Foods (commonly eggs, shellfish, nuts, berries, dyes, or other additives)
•Drugs (any drug can touch off an allergic reaction, although allergies to penicillin, sulfa, and aspirin are especially common)
•Pollens and plants (nettles, poison ivy, poison oak, and so on)
•Animal fur
•Insect bites or stings
•Exposure to heat, cold, or sunshine .In young children, a viral infection like a cold may trigger a bout of hives. Other potential triggers include physical exertion or exercise, stress, illness, chemicals, cosmetics, textiles, and pressure from materials rubbing against the skin.
Comfort is the main goal of treatment, since most hive outbreaks are relatively minor and short-lived. To soothe itchy skin, try cold compresses, calamine lotion, a cool shower, or a tepid bath with a few tablespoons of cornstarch (the kind sold in drugstores) thrown in. Try an over-the-counter antihistamine to reduce your body's response to the irritant and to relieve pain. Ask your doctor if you should take antihistamine pills.
In the case of a severe allergy, hives sometimes signal the onset of an allergic shock reaction that could cause your airways to swell, resulting in suffocation. Call 911 or have someone drive you to the emergency room immediately if you have trouble breathing or if you develop swelling in your eyes, lips, or throat.
Certain people have recurring outbreaks of hives for months or even years, and it's sometimes difficult to pinpoint the exact cause.
ref:http://www.myonlinewellness.com/topic/hivestreatment
Hope you find this information useful.