Basically, mucoceles are (cyst-like) structures covered with epithelium and filled with mucin, produced by the obstruction of the drainage ostium, due to their destructive capacity these usually cause pain [33] Retention cysts, on the other hand, have a linear epithelial cystic structure that does not cause destruction and these are caused by alterations in the homeostatic balance of the mucosa. The gene discussed is MUC5AC; the disease is cyst.