**Core Concept**
Paget's disease of the nipple is a rare form of breast cancer that involves the skin of the nipple and, sometimes, the areola. It is characterized by the presence of malignant cells in the epidermis, which is the outermost layer of the skin.

**Why the Correct Answer is Right**
Paget's disease of the nipple typically presents with eczematous changes in the nipple and areola, such as redness, itching, and scaling. The disease is often associated with an underlying ductal breast cancer, usually a ductal carcinoma in situ (DCIS) or invasive ductal carcinoma. The malignant cells in Paget's disease express estrogen and progesterone receptors, which are similar to those found in other types of breast cancer.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Paget's disease of the nipple is not typically associated with a viral etiology, unlike some other skin conditions.
**Option B:** This option is incorrect because Paget's disease of the nipple is not a form of inflammatory breast cancer, which is a distinct clinical entity characterized by rapid skin changes and lymphatic spread.
**Option C:** This option is incorrect because Paget's disease of the nipple is not primarily a condition of the apocrine glands, which are a type of sweat gland found in the axillary and inguinal regions.

**Clinical Pearl / High-Yield Fact**
Paget's disease of the nipple is often associated with an underlying ductal breast cancer, and a thorough evaluation of the breast is essential for accurate diagnosis and treatment planning.

**Correct Answer:** C.