**Core Concept**
Leprosy, also known as Hansen's disease, is a chronic bacterial infection caused by *Mycobacterium leprae* that affects the peripheral nerves, skin, and mucous membranes. Leprosy neuritis is a manifestation of the disease characterized by inflammation and damage to the peripheral nerves.

**Why the Correct Answer is Right**
In leprosy neuritis, the peripheral nerves undergo thickening due to the accumulation of collagen and other substances in response to the infection. This process, known as nerve thickening or neuritic thickening, is a hallmark of leprosy and can lead to nerve damage, pain, and disability. The thickening is often palpable and can be detected through physical examination.

**Why Each Wrong Option is Incorrect**
**Option A:** Intracutaneous thickening of the nerve is a characteristic feature of leprosy neuritis, making this option correct. The other options are incorrect because:
* **Option B:** Facial palsy is a possible complication of leprosy, but it is not a defining feature of leprosy neuritis.
* **Option C:** Leprosy primarily affects cooler, drier areas of the body, such as the skin and peripheral nerves, rather than warm and moist areas.
* **Option D:** Palpable peripheral nerves are present in leprosy neuritis, but this option is redundant and not as specific as the correct answer.
* **Option E:** While multiple lesions may be found in leprosy, the presence of > 10 lesions is not a defining feature of leprosy neuritis.

**Clinical Pearl / High-Yield Fact**
Leprosy neuritis often presents with numbness, pain, or weakness in the affected limb, and can be accompanied by skin lesions or discoloration. Early diagnosis and treatment are crucial to prevent permanent nerve damage and disability.

**Correct Answer:** d. Palpable peripheral nerves are present.