Discoloration of the skin, mucosa and nails is sideeffect of
**Core Concept**
Discoloration of the skin, mucosa, and nails is a side effect of certain medications that affect melanin production, melanin distribution, or keratinization. This phenomenon is often referred to as exogenous ochronosis or drug-induced pigmentation.
**Why the Correct Answer is Right**
The correct answer is a medication that contains **hydroquinone** or **phenol** derivatives, which are known to cause discoloration of the skin, mucosa, and nails. These compounds can inhibit the activity of **tyrosinase**, an enzyme responsible for converting tyrosine to melanin. As a result, melanin production is disrupted, leading to discoloration. Additionally, **phenol** derivatives can also cause **keratinization**, leading to thickening of the skin and mucous membranes.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it is not a known cause of discoloration of the skin, mucosa, and nails.
* **Option B:** This option is incorrect because it is a medication used to treat infections, not discoloration of the skin, mucosa, and nails.
* **Option D:** This option is incorrect because it is a medication used to treat high blood pressure, not discoloration of the skin, mucosa, and nails.
**Clinical Pearl / High-Yield Fact**
It's essential to note that discoloration caused by medications can be irreversible, making it crucial to monitor patients for this side effect and adjust treatment plans accordingly.
**Correct Answer:** C.