Erythrasma

Erythrasma is a skin disease that can result in pink patches, which can turn into brown scales. It is caused by the bacterium Corynebacterium minutissimum.

It is most commonly found in folds of skin.

Diagnosis
Wood's lamp is useful in diagnosing erythrasma. Use of a Wood's lamp causes the organism to fluoresce a coral red color, differentiating it from fungal infections and other skin conditions.

Treatment
It can be treated with erythromycin, or with antibacterial soap. Some studies have shown resolution with the use of Zithromax (azithromycin).