The diagnosis of<unk>  is based primarily on the physical examination, with recognition of the classic<unk>  lesions and pungent odor. Dermoscopic examination can facilitate visualization of pits and pit walls. A Wood's lamp may show coral red fluorescence, as seen in erythrasma. However, this finding is not uniformly present, as the condition may be caused by bacteria that do not produce fluorescent pigments. Further laboratory testing is not typically required for the diagnosis. However, a potassium hydroxide preparation can help rule out the presence of a fungal infection. Imaging and biopsy are not necessary. Differential diagnosis * Acid * Athlete's foot (Tinea pedis) * Erythrasma * Hyperhidrosis
Pitted keratolysis
Hyperhidrosis
Band keratopathy
Athlete's foot
Lattice corneal dystrophy
Erythrasma
Granular corneal dystrophy
Exposure keratopathy