And you won't see the long-term effects for at least 30 years. “I only had one bad sunburn there once.” Dr. Aubriana McEvoy , a Mohs surgeon at Siteman Cancer Center and a dermatology professor at WashU Medicine, hears versions of that line all the time. “And that’s exactly where we end up treating a skin cancer,” she said. When she examines those same patients, the rest of their skin tells a different story. “We commonly see more sun damage and skin cancers on the left hand and forearm from