**Core Concept**
The patient's symptoms are indicative of vitiligo, a chronic autoimmune disease characterized by the destruction of melanocytes, leading to loss of skin pigmentation. This results in well-demarcated, hypopigmented macules, often accompanied by scaly skin.

**Why the Correct Answer is Right**
Vitiligo is typically treated with topical corticosteroids or immunomodulators to suppress the autoimmune response and promote repigmentation. The use of topical corticosteroids, such as triamcinolone, can help to reduce inflammation and prevent further depigmentation. In some cases, phototherapy, including narrowband UVB or PUVA, may also be used to stimulate repigmentation.

**Why Each Wrong Option is Incorrect**
**Option A:**
This option is incorrect as it does not address the autoimmune nature of vitiligo. Topical antibiotics would not be effective in treating vitiligo.

**Option B:**
This option is incorrect as it implies a fungal infection, which is not consistent with the patient's symptoms. Fungal infections typically present with erythema, scaling, and pruritus, rather than hypopigmentation.

**Option C:**
This option is incorrect as it suggests a bacterial infection, which is not consistent with the patient's symptoms. Bacterial infections typically present with erythema, purulence, and a foul odor, rather than hypopigmentation.

**Option D:**
This option is incorrect as it suggests a viral infection, which is not consistent with the patient's symptoms. Viral infections typically present with vesicular lesions, erythema, and a self-limiting course, rather than hypopigmentation.

**Clinical Pearl / High-Yield Fact**
It's essential to differentiate vitiligo from other skin conditions, such as pityriasis alba, which can present with similar symptoms. Pityriasis alba is typically seen in children and young adults, and is characterized by well-demarcated, hypopigmented patches with a scaly surface.

**Correct Answer:** C. Topical corticosteroids.