Which of the following features are associated with psoriasis: September 2009
**Core Concept**
The question tests knowledge of **psoriasis**, a chronic autoimmune skin condition characterized by **keratinocyte proliferation** and **inflammation**. **Psoriatic lesions** are marked by **scaliness**, **erythema**, and **induration**.
**Why the Correct Answer is Right**
Although the specific correct answer choice is not provided, common features of psoriasis include **Auspitz's sign** (bleeding points after scale removal), **Koebner's phenomenon** (lesions forming at sites of skin trauma), and **nail changes**. These are due to **abnormal immune responses** and **keratinocyte hyperproliferation**.
**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific option text, a general approach is to recognize that incorrect options might include features not typically associated with psoriasis, such as **blistering** or **mucosal involvement**, which are more characteristic of other dermatological conditions.
**Option B:** Similarly, this might involve features that, while possibly seen in skin diseases, are not hallmark signs of psoriasis.
**Option C:** This option could potentially describe a feature that, while sometimes seen in psoriasis, is not as specific or diagnostic as other signs.
**Option D:** This might include a feature that is not commonly associated with psoriasis.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that **psoriasis** can be associated with **psoriatic arthritis**, emphasizing the importance of assessing for joint symptoms in patients with skin lesions.
**Correct Answer:** Correct Answer: D. Auspitz's sign, Koebner's phenomenon, nail changes.