Lipomas are uncommon oral tumours that make up between 1 and 4 percent of benign oral tumours. It often presents as an asymptomatic, soft, smooth-surfaced, nodular, yellowish mass, and most commonly affects the buccal mucosa, tongue, and floor of the mouth. Although there is a lot of conflicting information in the literature on the sensitivity and specificity of ultrasound in detecting lipomas, it has been used as a diagnostic tool for soft-tissue lesions for more than ten years. Understanding the various sites of oral lipomas inside the oral mucosa is crucial for accurate diagnosis and successful therapy. The case report of a 49-year-old man with an oral lipoma that developed in the mandibular buccal vestibule, a rare position, is presented in this article along with ultrasonographic results and a thorough literature analysis. The paper offers insightful analysis for those working in the field of oral healthcare by looking at the clinical presentation, histological traits, and probable differential diagnoses.