A 37-year female presents with multiple, linear, itchy wheals, with itching for 30 minutes at the site. The most probable diagnosis is:
## **Core Concept**
The question presents a clinical scenario suggestive of a specific dermatological condition characterized by multiple, linear, itchy wheals. This condition is related to an allergic reaction, likely involving the release of histamine and other mediators from mast cells.
## **Why the Correct Answer is Right**
The description provided—multiple, linear, itchy wheals with symptoms lasting about 30 minutes—strongly suggests **Dermatographic urticaria**, also known as **urticaria factitia** or **dermographism**. This condition is a physical urticaria where stroking or applying pressure to the skin results in linear wheals due to the release of histamine from mast cells. The symptoms typically resolve within 30 minutes to 2 hours, fitting the duration mentioned.
## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is not provided, but typically, conditions like **Acute urticaria** could be considered. However, acute urticaria presents with wheals that can appear anywhere on the body and are not necessarily linear or induced by pressure.
- **Option B:** Similarly, **Chronic urticaria** involves wheals that persist for more than 6 weeks, which does not specifically match the transient and mechanically induced nature of the symptoms described.
- **Option C:** Without a specific option provided, it's challenging to address directly, but other dermatological conditions like **eczema** or **psoriasis** do not typically present with linear, itchy wheals that resolve within 30 minutes.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that **dermatographic urticaria** is a benign condition often associated with **increased skin reactivity**. Patients might exhibit a "skin writing" phenomenon where tracing on the skin with a finger or object results in raised, itchy lines. This condition can be a manifestation of **mast cell disorders** or **atopy**, and patients often find relief with antihistamines.
## **Correct Answer:** D. Dermatographic urticaria.