gnathophyma gnathophyma gnathophyma involves swelling of the chin.: 693 it is a type of lesion associated with rosacea, a common chronic inflammatory skin disorder of the sebaceous (oily and fatty) glands characterized by redness, swelling, and acne-like pustules. gnathophymaspecialtydermatology other lesions associated with rosacea, which affects about 10 percent of fair-skinned people normally between the ages of 30 and 50, include: rhinophyma (enlarged nose) metophyma (enlarged cushion-like swelling of the forehead) blepharophyma (swelling of the eyelids) otophyma (a cauliflower-like swelling of the earlobes) treatment for mild to moderate cases includes an oral antibiotic or topical gel or cream.