**Core Concept**
Scabies is a skin infestation caused by the mite *Sarcoptes scabiei*, leading to intense pruritus and a characteristic rash. In adults, the presentation of scabies differs from that in children due to differences in skin thickness and mite behavior.

**Why the Correct Answer is Right**
In adults, scabies mites tend to burrow deeper into the skin, often avoiding the face, which has thicker skin and more sebaceous glands. This results in a reduced likelihood of scabies lesions on the face. In contrast, children's skin is thinner, and the mites are more likely to infest the face. This age-related difference in scabies presentation is crucial for accurate diagnosis.

**Why Each Wrong Option is Incorrect**
**Option B:** This statement is incorrect because, in both adults and children, scabies can involve the genital area, particularly in cases of crusted scabies or in immunocompromised individuals.

**Option C:** While the areola may be less frequently involved in scabies, this is not a reliable distinguishing feature between adult and pediatric scabies.

**Option D:** This statement is incorrect because, although scabies can involve large areas of the body, it typically spares the face in adults.

**Clinical Pearl / High-Yield Fact**
In diagnosing scabies, remember that the presence of burrows, particularly on the finger webs, is highly suggestive of the condition. Burrows are more easily detected in children, as their skin is thinner and more prone to infestation.

**✓ Correct Answer: A. Not involving face**