A 75-year-old man with a 3-year history of a slow growing “cyst” on the upper back presented to his dermatologist because the lesion has become painful. The patient denied any history of local trauma.
A 75-year-old man with a 3-year history of a slow growing “cyst” on the upper back presented to his dermatologist because the lesion has become painful. The patient denied any history of local trauma.
A 75-year-old man with a 3-year...