Hello, Lesions on the tongue that are present for months or experience a rapid change are of concern and should be seen by a doctor for a clinical examination. I suggest you schedule an appointment with an oral surgeon or ear, nose and throat specialist. Have you had a recent dental exam and is this noted I m your dental history? Do you have any broken teeth or a dental infection that may contribute to this condition? Consider calling your dentist to ask for some advice. Inflammation can cause an increase in pressure in surrounding tissue. This could explain some of the numbness. Your description of a purple color, could indicate a blood vessel. How is your blood pressure? Do you have any vascular disorders? Trauma to the tongue is common for people who grind their teeth or have bitten their tongue. Unfortunately once you bite your tongue and have an injury, there is a tendency to reinjure it again. Do you think this situation applies? Again, your dentist may help you evaluate the situation on a routine dental exam. Tumors, growths or cancer are best evaluated by a professional. Sudden change and pain is of greater concern. I am glad to provide additional information if you have more details to share. Take some anti-inflammatory medication such as Tylenol or Motrin and to reduce inflammation and swelling. Avoid irritants such as smoking and irritating foods. Rule out any habits or possible allergies that may contribute to the situation as well. I hope this is helpful to you. Thank you for your inquiry.