Hives and angioedema - Symptoms and causes - Mayo Clinic
网页2023年10月27日 · 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.
Chronic hives - Symptoms and causes - Mayo Clinic
网页2023年4月25日 · Symptoms of chronic hives include: Batches of welts (wheals) that can arise anywhere on the body. Welts that might be red, purple or skin-colored, depending on your skin color. Welts that vary in size, change shape, and appear and fade repeatedly. Itchiness (pruritus), which can be intense.
Itchy skin (pruritus) - Symptoms and causes - Mayo Clinic
网页2024年1月17日 · Itchy skin can affect small areas, such as the scalp, an arm or a leg. Or it can cover the whole body. Itchy skin can occur without any other noticeable changes on the skin. Or it may come with: Inflamed skin; Scratch marks; Bumps, spots or blisters; Dry, cracked skin; Leathery or scaly patches; Sometimes itchiness lasts a …
Cold urticaria - Symptoms & causes - Mayo Clinic
网页2021年12月15日 · 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.
Sun allergy - Symptoms and causes - Mayo Clinic
网页2024年7月19日 · Sun allergy is a broad term. It describes several conditions that cause an itchy rash to form on the skin after being in sunlight or other sources of ultraviolet (UV) radiation. Polymorphous light eruption is the most common form of sun allergy. Some people have a hereditary type of sun allergy.
Hives and angioedema - Diagnosis and treatment - Mayo Clinic
网页2023年10月27日 · To diagnose hives or angioedema, your doctor will likely look at your welts or areas of swelling and ask about your medical history. You may also need blood tests or an allergy skin test.
Mayo Clinic Q and A: Chronic Hives Come and Go With No Clear …
网页2016年2月16日 · ANSWER: What you may be experiencing is chronic hives. Hives (urticaria) are raised, red or white itchy welts on your skin. A sudden onset of hives (acute hives) usually has an identifiable cause or trigger — such as insect stings or bites, medications, certain foods, allergens, or infections.
Atopic dermatitis (eczema) - Symptoms and causes - Mayo Clinic
网页2024年5月15日 · Atopic dermatitis (eczema) is a condition that causes dry, itchy and inflamed skin. It's common in young children but can occur at any age. Atopic dermatitis is long lasting (chronic) and tends to flare sometimes. It can be irritating but it's not contagious.
Swimmer's itch - Symptoms and causes - Mayo Clinic
网页2023年5月10日 · Swimmer's itch symptoms include an itchy rash that looks like pimples or blisters. Symptoms may begin within minutes or as long as two days after swimming or wading in contaminated water. Usually the rash affects skin that's not covered by swimsuits, wetsuits or waders.
Dermatitis - Symptoms and causes - Mayo Clinic
网页It has many causes and forms and often involves itchy, dry skin or a rash. Or it might cause the skin to blister, ooze, crust or flake. Three common types of this condition are atopic dermatitis, contact dermatitis and seborrheic dermatitis.