What is a potential side effect of using tretinoin?

The correct response, which indicates that photosensitivity is a potential side effect of using tretinoin, is accurate because tretinoin, a topical retinoid commonly used for acne treatment and skin rejuvenation, can make the skin more sensitive to sunlight. This increased sensitivity can lead to a higher risk of sunburn and other forms of skin damage when exposed to UV radiation.

It is crucial for individuals using tretinoin to take proper sun protection measures, such as wearing sunscreen and protective clothing, especially during peak sun exposure times, to mitigate the risk of adverse effects from photosensitivity. While dry skin and skin discoloration can also occur with tretinoin use, they do not specifically highlight the increased risk of reaction to sunlight as photosensitivity does. Increased hair growth is not associated with the use of tretinoin and would not be considered a typical side effect.