Dennie-Morgan lines refer to the small creases that may develop along the lower eyelid. These lines are not associated with the normal process of aging. Dennie-Morgan lines are commonly associated with history of eczema or allergies. The etiology of Dennie-Morgan lines is described below: - atopic dermatitis - asthma - allergic rhinitis Reference: https://www.healthline.com/health/dennie-morgan-lines#treatments Image via: https://entokey.com/eyelid-dermatitis-and-other-dermatologic-conditions/