Detailed answer

To prevent hyperpigmentation during swimming or water activities, it is crucial to apply a broad-spectrum waterproof sunscreen with a high SPF to protect your skin from the sun's harmful UV rays. Make sure to reapply it every two hours, or more frequently if you are swimming or sweating. Additionally, wearing protective clothing, such as a wide-brimmed hat, a rash guard, and UV-protective sunglasses, can provide further defense against the sun. These measures help minimize sun damage and reduce the risk of developing hyperpigmentation.