Dr Chen Yi is a very rude doctor and I seriously recommend all patients avoid him at all costs. I visited him because I have rough red patch on my tongue for 12+ months and wanted to diagnose if there were any serious issues such as tongue cancer, etc. He made fun of my concerns and said it was nothing but a scratch. When I pressed him further, why the red patch will not heal for 12+ months he replied that he did not know but was not concerned.
Luckily I visited another ENT doctor who correctly diagnosed it as erythroplakia. This is serious condition and can turn to cancer. Always get a second opinion especially when dealing with Dr Chen Yi.