The warmer months are a great time for people to check their skin for signs of cancer. Dermatologist Dr. Katherine Gordon recommends looking for the following: moles that change, have irregular shapes, or uneven edges; moles that are multi-colored, such as brown, tan, and black; moles that are raised; moles that are large or have a diameter larger than the size of a pencil eraser; scales, itchiness, tenderness, or pain around a mole; a sore that does not heal or recurs; and brown or black streaks under a nail. UT Southwestern Medical Center, June 2018