6. Your feet
Enjoying summer in your sandals, flip flops, and bare feet? Then continue sunscreen application past the ankles; cover the whole foot (including the sole), each toe, and under the nails–malignant melanoma can be diagnosed on the soles of the feet as well as under the toenails. “The easiest way to do this–when you jump out of the shower, cover your body with sunscreen from head to toe. Treat it like you’re moisturizing yourself and then you’re not playing a guessing game,” Dr. Carroll says.