system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 45-year-old male patient complains of non-healing oral ulcer since a month over the lateral border of the tongue, on histologic examination abnormal keratinization is seen, what can be the possible diagnosis:
assistant
The correct answer is  None