Jock Itch vs. Other Groin Infections: How to Tell the Difference

Distinguishing Tinea Cruris from Bacterial, Candidal, and Other Rashes

Jock itch (tinea cruris) is a dermatophyte fungal infection. Other conditions mimic it; correct diagnosis guides therapy.

Comparison Table

Feature	Jock Itch (Tinea Cruris)	Candidal Intertrigo	Bacterial (Impetigo/Cellulitis)	Erythrasma	Psoriasis/Inverse Psoriasis
Appearance	Annular, scaly, raised border; central clearing	Beefy red, satellite pustules	Honey-crusted erosions or spreading erythema	Brown, finely scaly patches	Smooth, shiny, well-demarcated plaques
Itch	Intense	Moderate	Mild-moderate	Mild	Variable
Location	Groin, inner thighs, spares scrotum	Groin, scrotum, perianal	Anywhere	Groin, axillae, toe webs	Groin, axillae, inframammary
KOH Prep	Hyphae +	Yeast + pseudohyphae	Bacteria	Corynebacteria (coral red fluorescence)	Negative
Treatment	Topical terbinafine/azole 2–4 wks	Topical azole/nystatin	Topical/oral antibiotics	Topical/oral erythromycin	Topical steroids/calcipotriene

Key Differentiators

• Jock itch spares the scrotum (usually); candida involves it.
• Bacterial infections often have pustules/crusts and spread rapidly.
• Erythrasma fluoresces coral-red under Wood's lamp.
• Psoriasis lacks scaling in intertriginous areas; may have nail/palp plaques elsewhere.

When to See a Clinician

If OTC antifungal fails after 2 weeks, or if pain, swelling, fever, or spreading erythema develop.