If you are frecklier than others, it means that you have more active melanin cells in your skin. It also means you need to stay vigilant because skin types that freckle quickly are also at a greater risk of sunburn and/or skin cancer. Ahead are some useful tips on caring for your freckles this summer. (1) Keep your skin cool. Sun isn’t the only thing that causes freckles. Heat can trigger melanin activity, resulting in darker freckles. (2) A well-formulated vitamin C serum can suppress melanin cells and keep your freckles in check. (3) Be consistent about your SPF, and reapply every 90 minutes when you are outdoors.