**Core Concept**
Skin tuberculosis (TB) is a type of extrapulmonary TB that primarily affects the skin, often as a result of hematogenous or lymphatic spread from a primary focus, such as the lungs or lymph nodes. The skin manifestations of TB can vary greatly, ranging from localized lesions to widespread eruptions.

**Why the Correct Answer is Right**
In skin TB that involves the skin after involving lymph nodes, the condition is known as tuberculous lymphadenitis with secondary cutaneous involvement. This occurs when TB bacteria, typically Mycobacterium tuberculosis, infect the lymph nodes, leading to swelling and inflammation. As the infection progresses, the bacteria can spread to the skin through the lymphatic vessels, causing lesions or ulcers.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the scenario described, as it does not specifically address the involvement of lymph nodes prior to skin involvement.

**Option B:** While skin TB can be caused by direct inoculation of M. tuberculosis into the skin, this option does not account for the involvement of lymph nodes.

**Option C:** This option may be a distractor, but it does not accurately describe the pathogenesis of skin TB that involves the skin after lymph node involvement.

**Clinical Pearl / High-Yield Fact**
When encountering a skin lesion or rash, it's essential to consider the possibility of TB, especially in patients with a history of recent travel, immunosuppression, or exposure to someone with TB.

**Correct Answer:** D.