Skin dictionary: Letter U

Skin dictionary: Letter U

Learn the meaning of words that tell you more about your skin, hair, and nails.
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Ultraviolet rays/UV rays
(ul-tra-vi-e-let rays)
Light rays that the sun gives off. Tanning beds also can give off UV rays. The rays can damage the skin and cause skin cancer and wrinkling.

Urushiol (yoo-roo-shee-all)
The oil in poison ivy, poison oak, and poison sumac that can cause an allergic reaction. When it touches the skin, most people get an itchy rash.

UVA (U V A)
Also known as ultraviolet A, it is a type of light that the sun gives off, and that can damage your skin.

UVB (U V B)
Also known as ultraviolet B, it is a type of light that the sun gives off, and that can damage your skin.