Which clinical feature best distinguishes tinea corporis from tinea cruris in an Indian patient presenting with pruritic erythematous patches?

Question

Accepted Answer

C. Involvement of intertriginous areas with sharp demarcation and maceration. ## Distinguishing Tinea Corporis from Tinea Cruris

### Clinical Presentation Comparison

| Feature | Tinea Corporis | Tinea Cruris |
|---------|---|---|
| **Location** | Trunk, limbs, face | Inguinal folds, inner thighs, perianal |
| **Morphology** | Annular with central clearing | Sharply demarcated, often bilateral |
| **Border** | Raised, erythematous, scaly | Sharp, well-defined, may show maceration |
| **Maceration** | Absent | Present (due to moisture & friction) |
| **Pruritus** | Mild to moderate | Severe |

### Key Distinguishing Feature

**Key Point:** Tinea cruris characteristically involves **intertriginous areas** (skin folds) with **sharp demarcation** and **maceration** due to the warm, moist environment of the groin. Tinea corporis, by contrast, occurs on non-intertriginous surfaces and lacks the maceration seen in cruris.

**Clinical Pearl:** Tinea cruris is almost always bilateral and symmetric, whereas tinea corporis is often unilateral. The presence of maceration and involvement of skin folds is pathognomonic for cruris.

**High-Yield:** Remember: **Cruris = Crural (leg/thigh) + intertriginous**. The groin's moisture and friction create the ideal environment for maceration, which is the hallmark discriminator.

### Why Central Clearing Alone Is Not Discriminatory

Both conditions can present with annular lesions and central clearing. This is a common morphology in dermatophytosis but does not distinguish between the two sites.

### Hyperhidrosis and Poor Hygiene

While these are risk factors for both conditions, they are not discriminating features—both tinea corporis and tinea cruris are predisposed by these factors.

![Dermatophytosis — Tinea diagram](https://mmcphlazjonnzmdysowq.supabase.co/storage/v1/object/public/blog-images/explanation/4146.webp)

Answer

A. Presence of central clearing with raised erythematous border

Answer

B. Occurrence exclusively on exposed surfaces

Answer

D. Association with hyperhidrosis and poor hygiene

Which clinical feature best distinguishes tinea corporis from tinea cruris in an Indian patient presenting with pruritic erythematous patches?

Explanation

Distinguishing Tinea Corporis from Tinea Cruris

Clinical Presentation Comparison

Key Distinguishing Feature

Why Central Clearing Alone Is Not Discriminatory

Hyperhidrosis and Poor Hygiene

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Feature	Tinea Corporis	Tinea Cruris
Location	Trunk, limbs, face	Inguinal folds, inner thighs, perianal
Morphology	Annular with central clearing	Sharply demarcated, often bilateral
Border	Raised, erythematous, scaly	Sharp, well-defined, may show maceration
Maceration	Absent	Present (due to moisture & friction)
Pruritus	Mild to moderate	Severe