Dr Phil Kieran: It can be hard to figure out exact cause of eczema flare-ups

Dr Phil Kieran: "When the skin dries out, it can start to stretch, which can make it itchy. Scratching this area (particularly while asleep) can cause damage to the skin, leading to further moisture loss and perpetuating the problem. This scratching also increases the risk of bacteria entering the skin and causing an infection."
My 14-year-old daughter had an eczema flare-up out of the blue, which we’re treating with over-the-counter medication.Â
She had the condition as a child, but thankfully, she outgrew it. Is there any particular reason it reappeared, and what can she do to limit the likelihood of another flare-up?