Girls, has anyone experienced this? My daughter constantly gets irrita…

Girls, has anyone experienced this? My daughter constantly gets irritation around her mouth. Every time she eats something, it starts to turn red. At first, I thought it was because of a runny nose. She rubs her nose often, and we are always wiping it. The pediatrician also says it's nothing serious, probably because of that. But it's been dragging on. The cold has passed already. Though, she's probably only been without a runny nose for about a week. The ENT prescribed Zyrtec for treatment. We took it for 2 weeks, but the irritation is still there.