In a 6-year-old Indian child with impetigo, which is the most common site of involvement?

Question

Accepted Answer

C. Face and exposed areas. ## Most Common Site of Impetigo

**Key Point:** The face and other exposed areas (especially around the nose and mouth) are the most common sites of impetigo involvement, accounting for >50% of cases.

### Anatomical Distribution in Impetigo
| Site | Frequency | Reason |
|------|-----------|--------|
| Face (perioral, perinasal) | Most common (>50%) | Warm, moist, frequent minor trauma |
| Exposed areas (arms, legs) | Common | Sun exposure, minor cuts, abrasions |
| Intertriginous areas | Less common | Maceration, but less typical |
| Palms and soles | Rare | Thick stratum corneum, low moisture |
| Scalp | Uncommon | Hair barrier, less frequent inoculation |

### Why the Face?
1. **Frequent minor trauma:** Nasal picking, scratching, insect bites
2. **Warm, moist environment:** Promotes bacterial colonization
3. **High bacterial carriage:** S. aureus colonizes anterior nares and perinasal skin
4. **Proximity to mucous membranes:** Facilitates bacterial entry
5. **Poor hygiene in children:** Hands frequently touch face

**High-Yield:** In NEET PG, when asked about the most common site of impetigo, the answer is always the **face and exposed areas**. This is consistent across all major textbooks and epidemiological studies.

**Clinical Pearl:** The classic presentation is perioral and perinasal crusting in a child — this is the stereotypical impetigo picture. The lesions often cluster around areas of minor trauma or breaks in the skin barrier.

### Distinction from Other Staphylococcal Infections
- **Folliculitis:** Hair-bearing areas (scalp, beard, axillae)
- **Erysipelas:** Face (but with sharp demarcation and systemic symptoms)
- **Cellulitis:** Any site, but deeper involvement with systemic toxicity
- **Impetigo:** Superficial, face and exposed areas, minimal systemic symptoms

Answer

A. Scalp and hair-bearing areas

Answer

B. Intertriginous areas

Answer

D. Palms and soles

In a 6-year-old Indian child with impetigo, which is the most common site of involvement?

Explanation

Most Common Site of Impetigo

Anatomical Distribution in Impetigo

Why the Face?

Distinction from Other Staphylococcal Infections

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Site	Frequency	Reason
Face (perioral, perinasal)	Most common (>50%)	Warm, moist, frequent minor trauma
Exposed areas (arms, legs)	Common	Sun exposure, minor cuts, abrasions
Intertriginous areas	Less common	Maceration, but less typical
Palms and soles	Rare	Thick stratum corneum, low moisture
Scalp	Uncommon	Hair barrier, less frequent inoculation