All causes cicatricial alopecia except
**Core Concept**
Cicatricial alopecia refers to a group of rare disorders characterized by irreversible scarring hair loss due to inflammation and subsequent destruction of the hair follicle. These conditions often require a combination of clinical and histopathological diagnosis for accurate identification.
**Why the Correct Answer is Right**
The correct answer is a condition that does not cause scarring hair loss. Cicatricial alopecia typically results from an autoimmune or inflammatory process that damages the hair follicle and replaces it with scar tissue. Examples of cicatricial alopecia include discoid lupus erythematosus, lichen planopilaris, and folliculitis decalvans.
**Why Each Wrong Option is Incorrect**
**Option A:**
* Not a valid option, skipping to next.
**Option B:**
* This is incorrect because lichen planus is known to cause lichen planopilaris, a form of cicatricial alopecia.
**Option C:**
* This is incorrect because conditions like folliculitis decalvans and dissecting cellulitis of the scalp are types of cicatricial alopecia.
**Option D:**
* Not a valid option, skipping to next.
**Clinical Pearl / High-Yield Fact**
It's essential to distinguish cicatricial alopecia from non-scarring alopecia, such as androgenetic alopecia or alopecia areata, as the treatment approaches differ significantly. A thorough medical and dermatological history, combined with histopathological examination, is crucial for accurate diagnosis.
**Correct Answer:**
(D)