What effect does indoor tanning have on the skin?

Indoor tanning primarily involves exposure to UV radiation, which stimulates the skin's production of melanin, the pigment responsible for skin color. This increased melanin production leads to a temporary darkening of the skin, often referred to as a tan. This response occurs as the skin attempts to protect itself from further UV damage by increasing pigmentation.

The other effects mentioned in the choices are also associated with indoor tanning, such as increased UV sensitivity and decreased skin elasticity over time. However, the question is focused solely on the specific effects of indoor tanning rather than encompassing all the secondary consequences or risks.

Selecting the correct answer reflects an understanding of the immediate physiological response of the skin to UV exposure during indoor tanning, highlighting melanin production as a primary effect.