Many people use sunscreen when going outdoors, but not everyone remembers to reapply it regularly. Some patients seeking treatment for freckles either do not have the habit of using sunscreen or do not know how to reapply it properly.
Selecting Sunscreen with SPF 30 or Higher and Reapplying Every Two Hours
Using sunscreen not only prevents the formation of sunspots and reduces skin aging issues such as sagging and wrinkles but also helps prevent skin cancer. It is recommended to reapply sunscreen every two hours when outdoors.
When choosing sunscreen products, pay attention to the SPF value indicated on the label. This value represents the product’s ability to block Ultraviolet B (UVB) rays. It is advised to use products with an SPF of 30 or higher, as an SPF 30 sunscreen can block up to 97% of UVB rays. The higher the number reflecting the ability to block Ultraviolet A (UVA) rays, the better. For example, many Japanese sunscreens use the PA rating system, and it is recommended to choose products with a PA rating of three pluses (+++) or higher. Products labeled “Broad Spectrum” from other countries are also suitable choices.
Water-Resistant Sunscreen for Active Individuals
For those who tend to sweat profusely during physical activities or engage in water sports, it is essential to select water-resistant sunscreen products. The effective duration of these products ranges between 20 to 40 minutes. Be sure to read the instructions carefully to know how often to reapply and avoid sunspots and sunburns.