All of the following are disorders of hypopigmentation except:
**Core Concept**
The question tests the understanding of **hypopigmentation disorders**, which are conditions characterized by a reduction or absence of skin pigmentation. These disorders can be caused by various factors, including genetic mutations, autoimmune responses, and infections.
**Why the Correct Answer is Right**
Since the correct answer is not provided, let's analyze the common disorders of hypopigmentation, such as **vitiligo**, **albinism**, and **piebaldism**. These conditions are caused by a decrease or absence of **melanin** production, leading to white patches or spots on the skin.
**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific option, it's challenging to provide a detailed explanation. However, common disorders of hypopigmentation include **vitiligo** and **albinism**.
**Option B:** Similarly, without the specific option, it's difficult to provide a detailed explanation.
**Option C:** This option would be incorrect if it were a disorder of hypopigmentation, such as **piebaldism**.
**Option D:** This option would be the correct answer if it were a disorder of **hyperpigmentation**, such as **melasma**.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that **hypopigmentation** disorders can be distinguished from **hyperpigmentation** disorders by the presence of reduced or absent **melanin**.
**Correct Answer:** D. Melasma