Which of the following is/are not a subtype of lichen planus:
**Core Concept**
Lichen planus (LP) is a chronic inflammatory mucocutaneous disease characterized by a distinctive T-cell mediated immune response. It affects the skin, mucous membranes, and nails, and is often associated with autoimmune disorders. LP is a heterogeneous condition with various clinical subtypes.
**Why the Correct Answer is Right**
The correct answer is the one that does not belong to the subtypes of lichen planus. Lichen planus has several recognized subtypes, including:
* **Wickham's striae:** Characterized by white, lacy, or reticular lesions on the oral mucosa.
* **Annular lichen planus:** Presents with ring-shaped lesions, often on the extremities.
* **Hypertrophic lichen planus:** Features thickened, hyperkeratotic lesions.
* **Atrophic lichen planus:** Characterized by thinning of the epidermis and loss of rete ridges.
* **Bullous lichen planus:** Presents with blistering lesions.
* **Pigmented lichen planus:** Features hyperpigmentation.
* **Lichen planus pigmentosus:** A variant of lichen planus that presents with hyperpigmentation.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is not a recognized subtype of lichen planus.
**Option B:** This option is incorrect because it is not a recognized subtype of lichen planus.
**Option D:** This option is incorrect because it is not a recognized subtype of lichen planus.
**Clinical Pearl / High-Yield Fact**
Lichen planus is associated with an increased risk of developing other autoimmune disorders, such as lichen sclerosis, vitiligo, and autoimmune thyroid disease. It is essential to consider these associations when managing patients with lichen planus.
**Correct Answer:** D.