Dennie Morgan fold: cause
Wrinkles are generally considered a sign that your child has a predisposition to some atopy. Atopy is a hereditary hypersensitivity that can manifest in neurodermatitis, bronchial asthma, hay fever, and allergies. Dennie-Morgan wrinkles appear mainly in children, but can also be found in adults.
Important: Dennie-Morgan-Wrinkle suggests that the child is at increased risk for allergies, but this is not yet a reliable diagnostic sign. Therefore, you should speak to your pediatrician about it. If necessary, you can bring clarity with an allergy test.