Allergic contact cheilitis caused by menthol in toothpaste and throat medication: a case report.

A 29-year-old man, suffering from dry skin, who had a brother with rhinoconjunctivitis, was referred to us by a private dermatologist in January 2016 because of erythematous and scaly lips, which had been almost continuously present for >8 years. The eruption had started at both corners of the mouth, but gradually spread to the entire upper and lower lips. At consultation, we also observed erythema and scales at the philtrum, arranged in two vertical lines divided from each other at themidline