Malignant Dermoid Cyst

Malignant dermoid cyst refers to the cancerous transformation, which is rare, of a dermoid cyst: a lesion that is normally benign and contains tissues such as skin, follicles, or glands.

Why it matters: although most dermoid cysts are not dangerous, on rare occasions they can develop malignant cells, so any change deserves evaluation.

Signs to watch for: rapid growth, new pain, changes in the shape or consistency of a previously stable lesion.

Which specialist treats it? The dermatologist and the oncologist usually lead the workup, with support from the internist or the general practitioner in the initial evaluation. When a lesion changes or grows, the recommendation is to seek timely professional review rather than waiting.