Whether you’re exploring the trails around Fort Dickerson, letting the kids burn off energy at Lakeshore Park, or enjoying a quiet walk by the river, Knoxville’s outdoor spaces make it easy to spend time outside. But thick brush and overgrown areas can also hide poison ivy, oak, and sumac. When urushiol from these plants contacts your skin, it can trigger an itchy, uncomfortable rash that sometimes needs professional care. What a Poison Ivy ...