It is not true cyst, it occurs due to retention of mucous material, due to trauma, involving salivary glands and their ducts

Clinical features :-

• It occurs on lower lip, but may also occur in palate,cheek,tongue,floor of mouth.                                                     
• Recurrence is common.                   
• Superficial lesion appears as raised, bluish,translucent.
• There are two types a. Extravasation type  b. Retention type.
• Extravasation type is far more common than retention type.

Histological features:-

• Cavity of mucocele is lined by stratified squamous epithelium.           
• It’s wall is made of compressed fibrous connective tissue and fibroblast.                                               
• Lumen is filled with eosinophilic coagulum.

Treatment :-

Excision

Reference :-

Images :- Google
Writing :- notes made from Swapan Kumar Purkait, Mastering bds books