You will be asked to remove any clothes that cover the skin being treated. Areas that do not need treatment should be covered and protected as much as possible. Some safety steps include:

• Sunscreen to protect your neck, lips, and the backs of your hands.
• Special glasses or goggles to protect your eyes from UV light.
• Cover for genitals in men.
• Sunscreen for nipples and areola in women.

Make sure to inform your doctor about any medicine that you are currently taking. Some medicines, including over-the-counter medicine, can increase the risk of side effects.

Types of phototherapy include:

• Broad band UVB—Uses UV light, type B. It cannot be used in areas where there are skin folds.
• Narrow band UVB (nbUVB)—Uses a narrower range of UVB wavelengths. It can reach more specific areas, even skin folds.
• PUVA—This treatment includes a medicine called psoralen taken before treatment. It makes your skin more sensitive to the UV light. Psoralen can be taken as a pill or applied to the skin.
• Lasers—An excimer laser emits a UV light. It can be directed at specific areas of the skin.

Treatment over a large area may be treated in a treatment unit. You can stand in this unit during treatment. Smaller areas may be treated with smaller units. A laser treatment will use a laser light that is focused on the specific area.

The first treatment is usually very short, even a few seconds. Your phototherapy sessions will vary in length. It will depend on your skin type and the strength of the light chosen by your doctor. Treatments rarely last longer than a few minutes.

Treatment for skin conditions generally requires several treatments each week. The length of treatment will depend the type of phototherapy:

• Broad band therapy requires approximately 3-5 treatments each week.
• Narrow band therapy requires fewer treatments (2-3 treatments) each week.
• PUVA treatments generally require about 25 treatments over a 2-3 month period.
• Laser treatments are usually given twice a week and fewer sessions are required to clear the skin.

Treatments will continue until your skin is clear. Sometimes, occasional maintenance treatments are needed. The maintenance sessions can usually be done right in your doctor’s office, or even with a home UV light unit.

You may feel a warm sensation on your skin, similar to a mild sunburn. Your doctor can recommend medication if you have discomfort after treatment.

It is important to avoid natural sunlight when you are receiving UV light treatment:

• Clothing and sunscreen should be used when outdoors. They will help you avoid overexposure to UV light.
• There is an even bigger risk of sunburn after PUVA treatment. This is due to increased sensitivity from the psoralen.
• It is important to protect your eyes from sunlight exposure for the next 24 hours. This will help you to avoid cataracts, a clouding of the eye, after PUVA treatment.
• Antihistamines and other medicine may be given to ease the itching.

Your doctor should regularly examine your skin for skin cancer. UV light exposure from sunlight causes skin cancer. Long term PUVA treatment can also increase the risk of skin cancer. No studies have found a direct link from nb UVB phototherapy to skin cancer.

Be sure to follow your doctor's instructions .