Most bumps are rounded on top, but if you have hives, your bumps will have a flat surface. Hives are a rash that can develop anywhere on your body and may or may not cause itching, according to AskDrSears.com. Hives may be the result of various triggers, such as an allergy, overheating or touching irritants. If you have hives on your thighs and hands, call your doctor for further evaluation and treatment options. Hives typically are not a sign of a serious condition and typically subside within a few hours.
Background
About 20 percent of the American population will develop hives at one time in their life, according to the American College of Allergy, Asthma and Immunology. Hives develop in the skin when blood vessels dilate in localized areas. They appear as welts in various shapes and sizes but always have defined borders and are flat on top. The skin is elevated from the surface. The rash is red in color and will produce a white circle in the middle of the welt when pressure is applied. Hives are typically harmless, unless they develop in your ears or throat.
Causes
Hives are commonly the result of illness, food allergies, medications, insect bites, extreme temperatures and hypersensitivities to certain irritants. Hives resulting from the common cold or flu mostly occur in young children. Common foods that can trigger an outbreak of hives include nuts, berries, fish and shellfish, although any food allergy can cause hives. Insect bites that cause the development of hives may be a sign of anaphylaxis, a severe allergic reaction that will require emergency medical attention. Common irritants that can cause hives include soaps, detergents, cleaning products and perfumes.
Treatment
The most effective treatment for hives on your thighs and hands is to avoid all triggers. If you develop hives, call your doctor. Hives are commonly treated with over-the-counter antihistamines drugs that cause your blood vessels to constrict, alleviating the rash, according to the Mayo Clinic. Topical steroid creams may also be used to reduce swelling and irritation.
Warning
While most cases of hives subside within a few minutes or hours, if you develop shorten of breathe, chest tightness, lightheadedness, diarrhea, vomiting, an increased heart rate or facial inflammation, you may be experiencing a severe allergic reaction. Anaphylaxis can lead to death if not treated promptly with epinephrine. If you do not have epinephrine, call 911 immediately.
