Table A1.

Cutaneous cysts classification.

Stratified squamous epithelium	Non-stratified squamous epithelium	Absence of epithelium (pseudocysts)
-Epidermoid (infundibular) cyst -Milium -Trichilemmal cyst -Proliferating trichilemmal cyst Proliferating epidermoid (infundibular) cyst -Vellus hair cyst -Steatocystoma -Cutaneous keratocyst -Pigmented follicular cyst -Dermoid cyst -Verrucous cyst -Ear pit cyst -Pilonidal cyst	-Hydrocystoma (eccrine, apocrine) -Bronchogenic cyst -Thyroglossal duct cyst -Branchial cleft cyst -Cutaneous ciliated cyst -Ciliated cyst of the vulva -Median raphe cyst -Omphalomesenteric duct cyst	-Mucocele -Digital mucous cyst (pseudocyst) -Ganglion -Preudocyst of the auricle -Cutaneous metaplastic synovial cyst (pseudocyst)