The evaluation of tinea cruris begins with a history and physical exam.

Physical findings in someone with tinea cruris may include:

• Groin rash
• Skin redness
• Skin peeling
• Blisters

The diagnosis of tinea cruris can usually be made without testing.

Tests that may be used to evaluate tinea cruris include:

• Examination of the skin under an ultraviolet light
• Skin scraping:
• For examination under the microscope
• Fungal culture