Which of the following Mycobacteria is NOT associated with skin infections?

Mycobacterium kansasii is not typically associated with skin infections, which is why it is the correct answer to this question. This species is primarily known for causing pulmonary infections, similar to those seen with Mycobacterium tuberculosis. It is generally found in water sources and can lead to respiratory problems in immunocompromised individuals or those with underlying lung disease.

In contrast, Mycobacterium marinum is associated with skin infections, particularly those resulting from exposure to contaminated water, such as aquariums. It causes a condition known as "fish tank granuloma." Mycobacterium haemophilum is also linked to skin infections, especially in immunocompromised patients, presenting as ulcers or nodules. Mycobacterium ulcerans is most notorious for causing Buruli ulcer, a severe skin infection prevalent in certain tropical regions.

This distinction in pathogenicity is essential for understanding how various Mycobacteria can affect different body systems, particularly the skin versus the lungs. Thus, Mycobacterium kansasii stands out by not being typically involved in skin-related infections.