Background: Mucocele is the second most common benign soft tissue tumour occurring in the oral cavity. Clinically, a mucocele is characterized by an increase in volume, with a bubble-like shape that contains saliva, and is similarly colored to that of the normal mucosa or it may present blue coloration, depending on whether it is deep or superficial, respectively. A mucous cyst is common and harmless. However, if left untreated, it can organize and form a permanent bump on the inner surface of the lip. Literature contains a number of studies that confirm a traumatic etiology. This case report represents the treatment of a 22 year old male patient with a relapsing mucocele on the right side of the lower lip by diode laser as an alternative to conventional surgical technique due to its various advantages and also good patient acceptance.