Milial Cysts
Senait W. Dyson, MD
David Cassarino, MD, PhD
Key Facts
Terminology
Small epidermoid/infundibular cyst
Clinical Issues
Very common
Primary milial cysts
Occur spontaneously and typically seen on the face
Secondary milial cysts
Occur at sites of trauma or subepidermal blistering diseases
Microscopic Pathology
Dermal cyst lined by squamous epithelium with granular layer
Intraluminal laminated keratin
Top Differential Diagnoses
Epidermoid (epidermal inclusion, follicular infundibular) cyst
Vellus hair cyst
TERMINOLOGY
Synonyms
Milia
Definitions
Small epidermoid (follicular, infundibular-type) cysts