What type of lesions are typically associated with Blastomycosis?

Blastomycosis is primarily caused by the fungus Blastomyces dermatitidis, which often affects the lungs after inhalation of spores. Therefore, lung lesions are a hallmark of this infection. In addition to pulmonary involvement, Blastomyces can disseminate to other areas of the body, including the skin, bones, and genitourinary systems.

Skin lesions, which can take the form of ulcerated nodules or plaques, are also commonly noted in patients with disseminated blastomycosis, but they typically arise after the respiratory involvement. Bone involvement can occur as part of systemic dissemination but isn't as commonly emphasized as the lung and skin lesions. Liver lesions are not a typical manifestation of blastomycosis and are not routinely associated with this fungal infection.

Thus, lung lesions are indeed the primary type of lesions associated with initial blastomycosis, and if left untreated, the infection may lead to further systemic manifestations, including lesions in the skin and bones later in the disease course.