What type of skin lesion is described as solitary, faintly pigmented, and occurring at sites of previous trauma?

The correct answer is a dermatofibroma. Dermatofibromas are benign skin lesions that often present as solitary, firm nodules that can be slightly pigmented. They typically arise in response to trauma, such as insect bites or other minor skin injuries, and are most commonly found on the extremities. The faint pigmentation can vary, appearing as a brownish or skin-toned bump on the surface of the skin.

The connection to previous trauma is significant, as dermatofibromas often develop at sites where the skin has been subjected to some form of injury or irritation. Histologically, these lesions consist of a proliferation of fibroblasts, and when examined under the microscope, they show characteristic features that differentiate them from other skin lesions.

In contrast, Spitz naevi are generally more colorful, often exhibiting bright pink to red pigmentation, and they typically occur in younger individuals rather than following trauma. Atypical naevus syndrome refers to a condition involving multiple atypical moles, which may have varying shapes and colors but are not necessarily linked directly to trauma. Basal cell carcinoma often presents as a nodular lesion that may have additional features like pearly edges and possible ulceration, and while it can be solitary, its characteristics