Explanation: Phototherapy involves exposing the skin to UV light to treat psoriasis. During phototherapy sessions, patients should wear special shields to protect their eyes and genitals from potential UV damage.

Incorrect choices: a. Patients undergoing phototherapy are actually exposed to controlled amounts of UV light, which is different from uncontrolled sun exposure. Phototherapy is a prescribed treatment and should be done under healthcare professional supervision.

b. While phototherapy may cause temporary skin darkening or tanning, it is not associated with permanent changes in skin color.

d. Phototherapy does not increase the risk of skin infections. However, patients with psoriasis should practice good hygiene to prevent infections related to their condition and skin care routine.