You seem educated enough to understand that these signs are not indicative of any simple injury and warrant proper case evaluation. The first thing that you need to do is stop the Habit immediately because unless you do that any treatment will be absolutely ineffective. Try to visit in oral pathologist for a proper case evaluation so that the right diagnosis can be established and the right treatment can be advised to you accordingly. The inflammation of the gums is a minor problem in your case and can be corrected by cleaning of the gums by a procedure called as scaling. Regards

Hi. It is very very important for you to note that chewing tobacco and some countries, popular with areca nuts, increases the risk of oral cancer. This is widely cited in the literature. These red and white patches should be inspected by a dentist, and if any suspicion occurs the dentist will refer to you an Oral Medicine Specialist. It is wise for you to reduce the consumption or tobacco, either chewing or smoking it.