Final answer:
Lentigo maligna melanoma is a type of skin cancer that presents as a brownish discoloration on the skin. It is characterized by a large brown or black patch with uneven borders and a raised surface. Treatment usually involves surgical excision and sometimes immunotherapy.
Step-by-step explanation:
Lentigo maligna melanoma is a type of skin cancer that develops from melanocytes, the pigment-producing cells in the skin. It often presents as a brownish discoloration on the skin, which slowly enlarges over time.
Characteristics of lentigo maligna melanoma include a large brown or black patch with uneven borders and a raised surface. This type of melanoma is more common in older individuals, like the 75-year-old woman described in the question.
Diagnosis of lentigo maligna melanoma is typically confirmed through a biopsy, and treatment involves surgical excision and sometimes immunotherapy.