Dermoid cysts are cysts filled with sebum like material with evidence of specialized skin derivatives 1. Floor of mouth dermoid cysts account for 1.6% of all dermoid cysts 2 and they usually present as a midline symmetrical slowly enlarging lesion. Cysts superficial to geniohyoid may cause posterosuperior displacement of the tongue, dysphonia, dysphagia 3 or airway obstruction 4. While cysts inferior to geniohyoid can cause submental swelling 3.