**Core Concept:** Bouchard's nodes are small, oval-shaped lymph nodes that are part of the dermal papilla complex, located within the dermal papillae of the epidermis. They are visible on palpation and are commonly observed in the interdigital areas, particularly at the wrists and ankles, where they help protect the skin from friction-induced injury, aiding in wound healing and immune surveillance.

**Why the Correct Answer is Right:** Bouchard's nodes are a normal anatomical variation and are found at specific locations, such as in the interdigital areas of the wrists and ankles. Their primary function is to protect the skin from mechanical stress, promoting wound healing and immune surveillance.

**Why Each Wrong Option is Incorrect:**

A. **False:** Bouchard's nodes are not restricted to the elbows and knees. They are commonly found in the interdigital areas, as mentioned earlier.

B. **False:** While Bouchard's nodes contribute to wound healing, their primary function is not limited to this. They also aid in immune surveillance and protect the skin from mechanical stress.

C. **False:** Bouchard's nodes are not limited to the hands and feet. They are present in specific locations, including the interdigital areas of the wrists and ankles, as well as in other areas where mechanical stress is high.

D. **False:** Bouchard's nodes are not solely responsible for the sensation of touch. They have a broader role in protecting the skin from mechanical stress, promoting wound healing, and contributing to immune surveillance.

**Clinical Pearl:** Bouchard's nodes serve as an important clinical pearl for medical students and practitioners to recognize in clinical examination, particularly when assessing patients with skin lesions or abnormal skin findings, as they could indicate skin diseases or other pathologies.