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Hives — also called urticaria (ur-tih-KAR-e-uh) — is a skin reaction that causes itchy welts. Chronic hives are welts that last for more than six weeks and return often over months or years. Often, the cause of chronic hives isn't clear.
Hives — also known as urticaria (ur-tih-KAR-e-uh) — is a skin reaction that causes itchy welts that range in size from small spots to large blotches. Hives can be triggered by many situations and substances, including certain foods and medications. Angioedema can arise with hives or alone.
Where hives appear and how long it takes a welt to fade and whether it leaves behind a bruise or other mark. Whether your hives come with painful swelling. You also may need blood tests to determine the cause of your symptoms. An accurate diagnosis will guide your treatment.
Cold urticaria (ur-tih-KAR-e-uh) is a skin reaction to cold that appears within minutes after cold exposure. Affected skin develops itchy welts (hives). People with cold urticaria experience widely different symptoms. Some have minor reactions to the cold, while others have severe reactions.
If you're experiencing mild hives or angioedema, these tips may help relieve your symptoms: Avoid triggers. These can include foods, medications, pollen, pet dander, latex and insect stings. If you think a medication caused your rash, stop using it and contact your primary care provider.
Dermatographia is a condition in which lightly scratching your skin causes raised, inflamed lines or welts. These marks tend to go away in less than 30 minutes. The condition is also known as dermatographism and skin writing.
If you have cold urticaria, a raised bump (hive) will form a few minutes after the ice cube is removed. In some cases, cold urticaria is caused by an underlying condition that affects the immune system, such as an infection or cancer.
Learn more about the symptoms and treatment of this allergic skin reaction caused by cold that most often affects young adults.
Causes. Psoriasis is thought to be an immune system problem that causes skin cells to grow faster than usual. In the most common type of psoriasis, known as plaque psoriasis, this rapid turnover of cells results in dry, scaly patches. The cause of psoriasis isn't fully understood.
Parasites and allergies to medicines are common causes of eosinophilia. Hypereosinophilia can cause organ damage. This is called hypereosinophilic syndrome. The cause for this syndrome is often unknown. But it can result from some types of cancer such as bone marrow or lymph node cancer.