Cleveland’s parks, trails, and wooded areas, whether you’re walking the paths at Tinsley Park, exploring Charleston Park, or enjoying the shaded spots along the Greenway, make it easy to spend time outdoors. But thick brush and overgrown pathways also mean a higher chance of coming into contact with poison ivy, oak, or sumac. These plants contain urushiol, an oil that can cause a red, itchy, sometimes blistering rash. While many reactions stay mild ...