Nail deformity commonly seen in lichen planus are all of the following except: March 2009
**Core Concept**
Lichen planus is a chronic inflammatory mucocutaneous disease characterized by an autoimmune response against the basal cell layer of the skin and mucous membranes. Nail involvement is a common manifestation, leading to various deformities.
**Why the Correct Answer is Right**
Lichen planus-induced nail deformities are primarily due to the inflammatory process affecting the nail matrix and nail bed. The condition can lead to nail thickening, longitudinal ridging, and eventually, onycholysis (separation of the nail plate from the nail bed). The nail matrix is responsible for nail growth, and inflammation in this area can result in abnormal nail formation.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not listed, so I will continue with the next options.
**Option B:** Not applicable, as there is no information provided.
**Option C:** Not applicable, as there is no information provided.
**Option D:** Not applicable, as there is no information provided.
**Clinical Pearl / High-Yield Fact**
A classic clinical feature of lichen planus nail involvement is the presence of a "thin, brittle nail with longitudinal ridging and onycholysis." This combination of symptoms is often referred to as the "lichen planus nail."
**Correct Answer:** A.