A 55-year-old man visited his GP for an oral ulcer appeared two weeks ago, he also complained of difficulty in chewing and swallowing and speaking was painful. He is a heavy smoker and frequently consumes alcohol. Which diagnostic tests his GP should suggest?

What may be the most likely diagnosis in this case? *This case is from Docplexus editorial team from educative purpose only. Source: A Guide To Common Oral Lesions