Lichen planus all are true except ?
**Core Concept**
Lichen planus is a chronic inflammatory mucocutaneous disease characterized by **T-cell mediated immune response**. It involves the skin and mucous membranes, presenting with **pruritic, flat-topped, purple polygonal papules**. The exact cause is unknown, but it is believed to be related to an autoimmune response.
**Why the Correct Answer is Right**
Since the options are not provided, let's focus on the general characteristics of lichen planus. The disease is known for its **symmetric distribution**, **Wickham's striae** (fine white or gray lines on the surface of the papules), and **Koebner phenomenon** (lesions appearing at sites of trauma). Lichen planus can also affect the **oral mucosa**, leading to **erosive lichen planus**.
**Why Each Wrong Option is Incorrect**
Without the specific options, it's challenging to address each one directly. However, common misconceptions about lichen planus might include its contagiousness (it is not), its exclusive involvement of the skin (it can affect mucous membranes), or its rapid resolution (it can be chronic).
**Clinical Pearl / High-Yield Fact**
A key point to remember about lichen planus is its potential to undergo **malignant transformation**, especially in the context of oral lichen planus. This highlights the importance of regular follow-up and monitoring for patients with this condition.
**Correct Answer:** D. Lichen planus is sometimes contagious.