"Derm" within a word means it has to do with the skin. "Itis" means inflammation. So dermatitis is inflamed skin.
Contact dermatitis is a rash caused by touching (contacting) something that causes a reaction in your skin. The substance can irritate your skin (irritant contact dermatitis) or cause an allergic reaction (allergic contact dermatitis).
Thousands of substances can cause irritant contact dermatitis or allergic contact dermatitis
Contact dermatitis can start at any time in your life
If you get contact dermatitis from a certain thing once, you'll probably always get it when you touch that thing
The best way to treat contact dermatitis is to avoid whatever is causing it
Contact dermatitis can take up to 3 weeks to go away
Touching the rash won’t spread it to another person
Irritant contact dermatitis is caused by substances that irritate your skin when you touch them, such as:
Some people are more sensitive than others to irritants.
Allergic contact dermatitis is when your body’s immune system Overview of the Immune System The immune system is your body's defense system. It helps protect you from illness and infection. The immune system's job is to attack things that don’t belong in your body, including: Germs... read more reacts to a substance that touches your skin. You can become allergic to many different things, but the most common causes of allergic contact dermatitis are:
Sometimes you get contact dermatitis when sunlight shines on skin that has certain things on it, such as:
Doctors can usually tell that you have contact dermatitis by looking at your rash. However, it can be hard to tell exactly what substance caused the reaction.
If you don’t know the cause of your rash, your doctor may do tests to find out what caused it. These may include patch tests. In patch tests, your doctor puts small amounts of different substances on your skin to see if they cause contact dermatitis.
Doctors first treat contact dermatitis by making sure you don’t have more contact with the substance that caused the rash. Once the substance is gone, the rash goes away on its own.
The itching and blisters can be relieved with:
Putting a cloth dipped in cool water or aluminum acetate (Burow solution) on the rash several times a day
Cool baths with added colloidal oatmeal (a product made of finely ground oatmeal)
Antibiotics, if the skin becomes infected
Oral corticosteroids and medicines that slow down your immune system if the contact dermatitis is severe
Antihistamine pills can make you sleepy, particularly if you're older. Be careful about using them if you have to drive or use power tools. On the other hand, antihistamines may help you sleep at night.
There are several creams for itching that you can buy without a prescription. Antihistamine creams and skin-numbing creams that contain benzocaine sometimes cause a skin reaction, so doctors usually don't want you to use those.