The PA index is one of the indexes that shows the level of UV protection of sunscreen. Choosing a suitable sunscreen helps protect the skin from the harmful effects of UV rays.

Freckles are brown or light brown spots on the skin, resulting from clusters of skin cells containing the pigment melanin. Exposure to sunlight activates melanin-producing cells, leading to increased melanin production. Some methods to remove freckles include the use of sunscreen, laser treatment, and surgery.

Using sunscreen is a preventive measure to protect the skin from the harmful ultraviolet (UV) radiation of the sun. While sunscreen offers numerous advantages, such as preventing sunburn and premature aging, it also has certain drawbacks, including stickiness, potential skin irritation for certain skin types, and some ingredients being absorbed into the body, etc.