An<unk>  is a dark discoloration below the eye that is associated with<unk>  rhinitis and often seen in conjunction with bilateral Dennie–Morgan folds. These<unk> s are caused by venous congestion within the infraorbital groove, particularly from the nose. The characteristic infraorbital discoloration related to<unk> s is due to a backup in the venous network supplying the mucous membranes of the paranasal and nasal cavities draining primarily via the branches of the sphenopalatine veins passing backward to the pterygoid plexus. While a classic finding in pediatric patients with<unk>  rhinitis, these particular<unk> s will persist into adulthood if their<unk> s are not successfully addressed. The phenomenon was first documented in 1930 with the phrase being coined in 1954.
Allergic shiner
Allergic salute
Me-too drug
Inhalant
Toxicant
Cold medicine
Smokeless tobacco
Corrosive substance