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Ultraviolet light is made up of different wavelengths. Two forms are used during light therapy �C ultraviolet A (UVA) and ultraviolet B (UVB). UVA in natural sunlight is what causes your skin to tan, and may lead to long-term damage like wrinkles. UVB is the main cause of sunburn. Although light therapy uses these rays, they are used in a controlled way so that they are as safe as possible. Your dermatologist will talk to you about the risks and discuss any concerns and questions you may have.

Broad-band UVB and narrow-band UVB

UVB therapy can be broad-band UVB or narrow-band UVB. Broad-band UVB uses the full spectrum of UVB radiation while narrow-band UVB uses a small part of the UVB radiation.

Doctors recommend narrow-band UVB because it avoids some of the more harmful wavelengths. This means you��re less likely to have side-effects. It��s more intensive than broad-spectrum UVB, so treatment times are often shorter.

Psoralen ultraviolet A (PUVA)

To treat skin conditions, UVA is usually used together with a chemical called psoralen, which is found in plants. This causes your skin to become more sensitive to the light. Psoralen with UVA is known as PUVA.

PUVA is a more intensive treatment, so you may only have it if treatment with UVB hasn't worked for you. But it can be a better option for specific conditions like pustular psoriasis and when psoriasis plaques are particularly thick and white. It works well for moderate to severe eczema, especially on your hands and feet.