Tinea versicolor is a fungal infection of the skin. It's also called pityriasis versicolor and is caused by a type of yeast that naturally lives on your skin. When the yeast grows out of control, the skin disease, which appears as a rash, is the result.
The infection can happen for any of the following reasons:
You have oily skin
You live in a hot climate
You sweat a lot
You have a weak immune system
Because the yeast grows naturally on your skin, tinea versicolor is not contagious...
If you have mild scaling, it may get better on its own. Sometimes, though, you'll need treatment. It can take a couple of months or longer to get more severe dandruff under control. Once you do, you may be able to keep it from flaring with special shampoos or moisturizers.
The most common treatments for mild cases are medications that you put directly on your scalp. If you have a more severe case or have psoriasis elsewhere on your body, you may need a medication that treats your whole body. You can take these medications by mouth or injection.
If your psoriasis doesn't respond well after repeated use of one medication, your doctor may replace or combine it with another type of treatment.
One of the first steps is to soften and remove scales. This makes it easier for medications to do their job.
Apply over-the-counter (OTC) products to your scalp to help soften scales and make them easier to peel off. Look for products with the active ingredients salicylic acid, lactic acid, urea, zinc pyrithione, or selenium sulfide.
Gently loosen the scales with a brush or fine-toothed comb.
Shampoo your scalp to remove the scales, using a salicylic acid shampoo or soap.
Apply thick moisturizers like petroleum jelly to your scalp while it's still damp.
To apply medication:
Put petroleum jelly on cotton balls and put them into your ears to keep medications out.
Use medications sparingly. They may cause skin irritation and can weaken hair shafts, causing temporary hair loss.
With an oil or lotion, part your hair and drip the medication onto your scalp.
With a cream or ointment, rub it right into your scalp.
Covering your scalp with a shower cap for a short period of time may help some medications work better, but check with your doctor first.