Introduction

Photo of a man sweating a lot (PantherMedia / Ingeborg Knol)

Tinea versicolor, also referred to as pityriasis versicolor, is a skin condition characterized by patches of lighter or darker skin. It is caused by a type of yeast (fungus) that is found on most people's skin. It is generally not harmful and it isn't contagious.

Topical treatments (applied directly to the affected area), such as special creams or shampoos, are usually effective.

Symptoms

In tinea versicolor, small round or oval patches of skin appear at first, and later merge into larger patches with irregular shapes. They are especially common on the back, chest, neck and/or arms. They may occur on the face as well, particularly in children.

The patches may be yellow or brownish, or sometimes red or pink. They are usually lighter or darker than the surrounding healthy skin. Because these patches hardly change color in the sun, they are more noticeable if you have a suntan. The affected areas of skin may also be somewhat scaly. They rarely itch. If they do, then they only itch a little.

Illustration: Tinea versicolor on the upper body – as described in the informationTinea versicolor on the upper body

Causes

Tinea versicolor is caused by a type of yeast (fungus) that is found on most people's skin. It’s not clear exactly why the fungus grows and causes visible patches in some people but not in others.

It's important to know that tinea versicolor has nothing to do with poor hygiene, and it’s not contagious.

Risk factors

Various factors can increase your chances of developing tinea versicolor. These include

  • a warm and humid climate,
  • sweating a lot (for instance in people who generally sweat more or who do a lot of sports) and
  • the use of oils or cosmetics that may clog the skin pores.

Genes probably play an important role too.

People who have a weakened immune system are generally more susceptible to infections, so they are also more likely to develop tinea versicolor. The immune system may be weakened by things like certain types of cancer or medication that suppresses the immune system – for instance, following an organ transplant.

Prevalence

Tinea versicolor is a common skin condition. In countries with a more moderate climate it affects about 1% of the population, and in some tropical countries it affects about 40%. It is just as common in men as it is in women. Most people first get it at a young age.

Diagnosis

Doctors can often recognize tinea versicolor just by looking at the typical groups of light or dark patches on the upper body and/or arms. To rule out other possible skin conditions, your doctor might use a strip of clear adhesive tape to take a sample of the scaly skin and look at it under a microscope. This is usually enough to determine whether it is tinea versicolor.

Treatment

Tinea versicolor may improve a little in cool or dry weather, but it usually doesn’t go away on its own. There are a number of effective treatments. These mainly include creams, lotions and shampoos that contain antifungals (substances that kill the fungus or inhibit its growth). The creams and lotions are applied to the affected areas of skin. The shampoo is used too, so that the fungus doesn't spread back to the skin from the scalp and hair. Depending on the exact product used, it needs to be left on for anywhere from a few minutes to several hours. The creams and lotions are often put on in the evening and then rinsed off in the shower the next morning.

But even when treatment works, it can take up to several weeks or months for the skin patches to disappear. Treatment with tablets is only rarely needed.

Sometimes tinea versicolor comes back again after successful treatment. If this keeps happening, doctors may recommend using a special shampoo on your skin and hair every two to four weeks to prevent it from returning again. The shampoo contains an active ingredient like selenium sulfide or ketoconazole. There are also oral medications (tablets) that can be taken every four weeks to prevent tinea versicolor from returning. Doing either of these things can greatly reduce the risk of it coming back.

Learn more

Further information

When people are ill or need medical advice, they usually go to see their family doctor first. Read about how to find the right doctor, how to prepare for the appointment and what to remember.