A pre-cancerous lesion, sometimes called dysplasia, is considered a very important find. Depending on the type of lesion, they often require monitoring and may require management to lower the risk of malignant transformation. Pre-cancerous lesions are typically categorized according to color and severity. Lesions may have characteristics that include leukoplakia (white), erythroplakia (red), and erythroleukoplakia (red and white mixed lesion). There may be a recommendation for a biopsy which is one way to confirm this diagnosis. A biopsy may classify the lesion as mild, moderate or severe, with the risk of malignant transformation increasing with severity. The finding of a pre-cancerous lesion often requires a treatment team for frequent and long-term follow up to monitor for changes that could require further treatment.