Laboratory Studies
- Potassium hydroxide (KOH) test, Gram stain, or culture is useful to exclude primary or secondary infection and to guide intertrigo therapy.
- Wood lamp examination can exclude erythrasma.
- Perform appropriate workup if systemic disease is suspected along with the intertrigo (diabetes, acrodermatitis enteropathica, necrolytic migratory erythema secondary to glucagonoma) or if intertrigo responds poorly to treatment.
Procedures
- Skin biopsy may help exclude inverse psoriasis, Bowen disease, Paget disease, or metastatic carcinoma.
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