HomeAnswersDentistryoral ulcerWill smoking cause red and black patches inside the mouth?

Can smoking cause red and black patches in the mouth?


The following is an actual conversation between an iCliniq user and a doctor that has been reviewed and published as a Premium Q&A.

Medically reviewed by

iCliniq medical review team

Published At March 10, 2017
Reviewed AtJune 22, 2021

Patient's Query

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.


Welcome to icliniq.com.

  • The red and black patches which are painful are mostly oral ulcers. The blackish color should be the effect of the smoking habit.
  • With the history you have given, I suspect it to be nicotine stomatitis, which is ulcers due to smoking.
  • Vitamin B12 deficiency and stress are again a major cause of mouth ulcers. Please do not panic relating it to oral cancer.
  • You will be fine once you take vitamin supplements in the form of tablets or food. I recommend you eat a lot of green leafy vegetables like spinach and nuts rich in vitamin B12.
  • Smoking will cause obvious dryness of the mouth, so please drink plenty of water and stay hydrated.
  • For pain relief, apply Dentogel (Benzalkonium chloride) 15 g thrice daily with clean fingers and massage for 2 to 3 minutes and wash off with normal water.
  • Also, please quit smoking slowly. It will help you stay away from a lot of oral diseases.

For more information consult a dentist online --> https://www.icliniq.com/ask-a-doctor-online/dentist

Same symptoms don't mean you have the same problem. Consult a doctor now!

Dr. Geethanjali. S. S
Dr. Geethanjali. S. S


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