In a healthy body, mast cells (the “lookout” cells of the immune system) only release histamine when they detect a foreign invader, like pollen or venom. In CSU, these cells dump histamine into the ...

Skin reactions can be alarming, especially when they appear suddenly. Many people struggle to tell the difference between hives and a rash, but knowing the cause is the first step toward relief. Black ...

Sun allergy is a term often used to describe a number of conditions in which an itchy red rash occurs on skin that has been exposed to sunlight. The most common form of sun allergy is polymorphic ...

Beaches can harbor various allergens, including pollen, insects, and chemicals in sunscreen, which can trigger allergic reactions in individuals who are susceptible. Various skin conditions, such as ...

Don’t have a sun allergy? These recommendations still apply to you. If you’ve never heard of a sun allergy, you’re not alone. This idea was foreign to me until a few weeks ago, when I broke out in ...

Hives that come back daily for 6 weeks or more are called chronic hives, or chronic urticaria. The condition often has no known cause, but allergies, autoimmune conditions, physical stimuli, and ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Picture this: You’re going about your day, when all of a sudden you spot a red, splotchy rash on your ...

Itchy skin rashes are unsightly and uncomfortable, but you don’t need to put up with them forever. To help you find quick relief, start with this list of the best creams for itchy skin rash. Atopic ...