What is tinea versicolor?

Tinea versicolor is a skin infection. It causes many small spots, usually on the parts of the upper body like the chest and neck. The spots may form patches that have fine scales. The spots and patches may be lighter or darker than the skin around them.

The fungus that causes tinea versicolor normally lives on your skin. Sometimes it can cause a rash. This happens more often where it's hot and humid. Having an impaired immune system may increase your chance of getting this rash. Some people, especially teens and young adults, are more likely to get tinea versicolor. Tinea versicolor doesn't spread from person to person.

You can treat tinea versicolor with cream, ointment, or shampoo. You may need pills if the spots cover a lot of your body. Treatment kills the fungus quickly. Your skin, though, may not return to its normal color for months after treatment.

Symptoms include small, flat spots that frequently form patches. They might itch. The patches often occur on the chest, upper arms, or neck. The spots can be lighter or darker than the skin around them. They may be white, pink, red, tan, brown, purple, or gray-black.

Tinea versicolor can be treated with medicines put on the skin. Treatment kills the fungi quickly and keeps the rash from spreading. But it can take months for the spots to disappear and for your skin color to return to normal.

Your doctor will talk with you about what kind of product may work best for you. These may include antifungal cream, ointment, foam, or shampoo. You may need to use these products on your skin for 1 to 2 weeks or longer.

Shampoos can be used on the body as well as the head and may be easier to use than creams or foams. Selsun Blue or Head and Shoulders are over-the-counter shampoos that may help treat tinea versicolor. They aren't as strong as prescription medicines and may not work as well.

You may need pills if the rash doesn't get better or covers a lot of your body.

If you have frequent problems with tinea versicolor, there are a couple of things you can do so that it is less likely to come back.

• Use antifungal skin creams, shampoos, or solutions at least once a month. Ask your doctor if you should use them more often.
• Talk to your doctor about taking antifungal pills once a month. Most people don't need to do this, but it can help in some cases.

Your doctor often can tell if you have tinea versicolor by looking at the spots.

The doctor may look at a sample (scraping) of the infected skin under a microscope. The test used most often for this is the KOH test. Or the doctor may use a special light called a Wood's lamp to look closely at your spots. Both of these tests can show whether the problem is caused by a fungus.

• Follow the directions for use of creams, shampoos, or solutions. You will probably need to use them for 1 to 2 weeks. If your skin gets irritated, stop using the product, and call your doctor.
• Dry off well after bathing. Keep your skin dry.
• If the rash keeps coming back, you may want to use a cream, shampoo, or solution one time a month. Your doctor may prescribe pills to prevent the spots from returning.

Tinea versicolor is caused by a fungus. This fungus lives all around us, including on the skin. Normally it doesn't cause a problem. But sometimes it can lead to spots on the skin. This happens more often in hot and humid weather.