Definition

Pityriasis versicolor is a common infection of the skin. It is causes small, scaly patches with different colors. It is usually easy to treat.

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Causes

Pityriasis versicolor is caused by a fungus. The fungus is normally found in small amounts on the skin and scalp. A change in environment can lead to an overgrowth of the fungus. This leads to symptoms.

Risk Factors

This condition is more common in teens and young adults. Other things that raise the risk are:

• Physical activity
• Very sweaty skin
• Using oils on the skin
• Warm, humid weather
• A weak immune system

Symptoms

Pityriasis versicolor often affects large areas of the skin. Symptoms may include:

• Thin, small, patches that may be:
  • Pale yellow, dark brown, or yellowish brown
  • Shades of red, pink, or orange
  • Light or dark
• Light scaling on affected areas
• Little to no itching

Diagnosis

The doctor will ask about symptoms and past health. A physical exam will be done. A special light may be used to examine the skin. The doctor may suspect pityriasis versicolor based on the exam.

A skin doctor may scrape and test a sample of the skin. This can confirm the diagnosis.

Treatment

The goal is to clear the infection. Pityriasis versicolor may be treated with:

• Antifungal lotions, creams, or shampoos—applied to the skin
• Antifungal pills taken by mouth—used for widespread infections

Skin may return to its normal color. It may take several months to a few years after treatment. The condition may also improve in the winter and return in the summer.

Prevention

Treatment may be used to keep the infection from coming back.