**Core Concept**
Lichen planus is a chronic inflammatory mucocutaneous disease characterized by a T-cell mediated immune response, leading to damage of the basal layer of the epidermis and mucous membranes. The lesions of lichen planus are typically hyperplastic and exhibit a band-like, lymphocytic infiltrate at the dermo-epidermal junction.

**Why the Correct Answer is Right**
The lesions of lichen planus are characterized by hyperplasia of the epidermis, thickening of the basement membrane, and a band-like lymphocytic infiltrate at the dermo-epidermal junction. This is due to the activation of T-cells, which recognize antigens on the basal keratinocytes and trigger a cytotoxic response. The resulting inflammation and tissue damage lead to the characteristic lesions of lichen planus.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because lichen planus lesions are typically not characterized by a neutrophilic infiltrate.
**Option B:** Incorrect because lichen planus is not primarily an autoimmune disease, although autoantibodies may be present in some cases.
**Option C:** Incorrect because while lichen planus can involve the mucous membranes, the characteristic lesions are not primarily found in these areas.

**Clinical Pearl / High-Yield Fact**
Lichen planus is often associated with other autoimmune diseases, such as thyroiditis and vitiligo, and may also be triggered by medications, particularly those that alter the immune response.

**Correct Answer:** C.