**Core Concept**
Lesions in patients with a history of HIV can be indicative of various opportunistic infections or malignancies. The patient's immune status plays a crucial role in determining the nature and severity of these lesions.

**Why the Correct Answer is Right**
The presence of lesions in an HIV-positive patient warrants a thorough evaluation for possible opportunistic infections or malignancies, such as Kaposi's sarcoma, non-Hodgkin lymphoma, or skin cancers. A thorough history, physical examination, and diagnostic tests, including skin biopsy and imaging studies, are essential for accurate diagnosis. In the context of the question, the correct answer is likely to be a diagnostic test, such as skin biopsy.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because empiric treatment without a definitive diagnosis may lead to unnecessary side effects and delayed diagnosis of a potentially life-threatening condition.
**Option B:** This option is incorrect because a routine physical examination may not be sufficient to diagnose the underlying cause of the lesions, especially in immunocompromised patients.
**Option C:** This option is incorrect because antiretroviral therapy (ART) is essential for managing HIV, but it does not address the immediate concern of the lesions.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that a high index of suspicion and prompt evaluation are critical in diagnosing opportunistic infections or malignancies in HIV-positive patients, as delay in diagnosis can lead to poor outcomes.

**Correct Answer:** C.