Final answer:
Oral contraceptives can make melasma worse, while other medications such as hydroquinone, retinoids, and sunscreen are used to treat or prevent melasma.
Step-by-step explanation:
Out of the options given, oral contraceptives can make melasma worse. Melasma is a skin condition that causes dark patches on the skin, typically on the face. Hormonal changes in the body, including those caused by oral contraceptives, can trigger or worsen melasma. Hydroquinone, retinoids, and sunscreen are actually used to treat or prevent melasma.