Shiny, pearly white, hemispherical umbilicated papule with central depression may be a feature of: March 2013
**Core Concept**
The question describes a specific dermatological lesion characterized by its shiny, pearly white appearance, hemispherical shape, and central umbilication. This clinical presentation is a classic example of a benign skin tumor that arises from the basal layer of the epidermis.
**Why the Correct Answer is Right**
The lesion is likely a **molluscum contagiosum**, a common viral infection caused by the molluscum contagiosum virus (MCV). The virus infects the keratinocytes, leading to the formation of a characteristic pearly white, hemispherical papule with a central umbilication. This umbilication is a result of the viral particles accumulating in the center of the lesion, creating a central depression. The shiny appearance is due to the compact grouping of infected cells.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as it is not a characteristic feature of other common skin conditions such as warts or keratoacanthomas.
* **Option B:** This option is incorrect as it does not describe the clinical presentation of other benign skin tumors such as seborrheic keratoses or dermatofibromas.
* **Option C:** This option is incorrect as it is not a feature of other viral infections such as herpes simplex or varicella-zoster.
**Clinical Pearl / High-Yield Fact**
Molluscum contagiosum is highly contagious and can be transmitted through direct contact with an infected person or through contaminated objects. It is essential to practice good hygiene and avoid touching or scratching the affected area to prevent further spread.
**Correct Answer:** C.