Which type of mole is described as flat and sessile?

The correct response identifies moles, specifically in the context of their presentation in the skin. Flat and sessile moles are typically described as being raised above the skin surface but lacking significant elevation or pedunculation, meaning they do not have a stem-like structure.

Moles, in the medical terminology "nevi" or "naevae," can appear in various forms, and the flat, sessile variant describes those that are smooth and often lighter in color compared to their raised counterparts. This flat appearance is often associated with benign nevi that do not pose any risk of changing into malignant forms.

Port wine stains represent vascular malformations rather than moles, and papillomas typically refer to benign epithelial tumors that might not engage the same descriptive language regarding flatness and being sessile. Hence, recognizing that the terminology related to moles meets the criteria of being flat and sessile helps clarify why this choice is the correct one.