**Core Concept**
Port-wine hemangiomas are a type of vascular malformation characterized by an abnormal collection of blood vessels. Treatment options vary depending on the size, location, and age of the patient. The best method of treatment aims to reduce the size and appearance of the lesion while minimizing potential complications.

**Why the Correct Answer is Right**
The correct answer involves the use of pulsed dye laser (PDL) therapy, which is a non-invasive treatment that targets the vascular endothelium of the hemangioma. PDL emits a high-intensity beam of light that selectively damages the abnormal blood vessels, leading to their reduction in size and decreased visibility. This treatment is particularly effective for port-wine hemangiomas due to their superficial location and the presence of a well-defined vascular bed.

**Why Each Wrong Option is Incorrect**
**Option A:** Surgical excision may be considered for large or symptomatic port-wine hemangiomas, but it is generally reserved for cases where laser therapy is ineffective or not feasible. Surgical excision carries a higher risk of complications, such as scarring and bleeding.
**Option B:** Radiofrequency ablation is a treatment option for deep or large vascular lesions, but it is not typically used for port-wine hemangiomas due to their superficial location and the risk of scarring.
**Option C:** Steroid injections can be used to treat certain types of vascular lesions, but they are not effective for port-wine hemangiomas and may even exacerbate the condition.

**Clinical Pearl / High-Yield Fact**
When treating port-wine hemangiomas, it is essential to use a combination of laser therapy and compression garments to minimize the risk of complications and promote optimal outcomes. Regular follow-up appointments are also crucial to monitor the lesion's response to treatment and adjust the treatment plan as needed.

**Correct Answer:** C.