<unk>  (PEN) is a rare, benign cutaneous condition characterized by small, firm, non-pigmented nodules or papules. They typically occur as a solitary (single) lesion near the mucocutaneous junction of the skin of the face, although they can occur elsewhere on the body.
Palisaded encapsulated neuroma
Basal-cell carcinoma
Solitary cutaneous leiomyoma
Melanocytic nevus
Bizarre parosteal osteochondromatous proliferation
Skin appendage
Malignant chondroid syringoma
Neurofibroma