Hello doctor, I am a 22 year old male, who weighs 90 kg and 6 feet tall. I have pain in my chest and dyspnea from the past four months. For the last ten days, I noticed black and red patches in my mouth. I use tobacco, so I am scared that I have cancer. The spots are present on both side in my mouth and are paining. My cheek muscles pain and contract sometimes. I have increased appetite. My mouth feels dry, and I have a bump on the back of my head. My exams are going on, so please help me. I consulted a doctor for my chest pain and dyspnea, four months back. Tests showed that my vitamin B12 was 54 pg/mL.
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