Final answer:
The lesion on the left buccal mucosa could be a small lesion with an irregular border or a large brown spot with darker specks, suggestive of various skin conditions, including the possibility of cancer. A medical assessment is necessary for an accurate diagnosis.
Step-by-step explanation:
The lesion on the left buccal mucosa could best be described based on several potential characteristics discussed in the reference material. It could be a small lesion with an irregular border and parts that appear red, white, blue, or blue-black, which may suggest a pathology such as melanoma considering the described appearance. It may also be a large brown spot on the skin sprinkled with darker specks, which could be indicative of another type of pigmented lesion, such as a benign nevus or a seborrheic keratosis. Lastly, if the lesion is a dark lesion located on mucous membranes, it increases the suspicion of mucosal melanoma, especially if found on typically non-pigmented areas like the buccal mucosa. Medical assessment and potential biopsy would be essential for accurate diagnosis and to rule out serious conditions such as cancer.