A female has hypopigmented lesion on centre of forehead drug, responsible is:
## **Core Concept**
The question pertains to a condition known as **hypertrichosis** or more specifically, **hypopigmentation** caused by a drug. The location of the lesion, on the center of the forehead, hints towards a condition that could be related to **monobenzone** or **hydroquinone** application, but given the context, it seems more aligned with **monobenzone** which is used in the treatment of **vitiligo**.
## **Why the Correct Answer is Right**
Monobenzone, also known as **monobenzyl ether of hydroquinone**, is a potent **depigmenting agent**. When applied to the skin, it can cause **permanent depigmentation** due to its toxic effect on **melanocytes**. The center of the forehead is a common site for application in the treatment of **vitiligo**, which results in **hypopigmentation** or depigmentation in the treated area. This matches the scenario described.
## **Why Each Wrong Option is Incorrect**
- **Option A:** Without specific details on the drug, it's hard to directly refute, but given the context, it's less likely related to **hypopigmentation** caused by a drug applied on the forehead.
- **Option B:** Similarly, without specifics, it's challenging to directly address, but **hydroquinone** is less potent than monobenzone and usually does not cause permanent depigmentation.
- **Option D:** This option is also unspecified, making direct refutation difficult.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that **monobenzone** can cause **irreversible depigmentation** and is used cautiously in **vitiligo** treatment. Its application should be carefully considered due to the risk of **permanent skin lightening**.
## **Correct Answer:** .