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The chances are excellent that your issue is not serious - it's very unlikely from what you've described that it is cancerous, so not to worry.
you probably have an inflamed or blocked salivary duct. This can be caused by trauma (something sharp, chemical or heat burn) or a blocked salivary dust from a small salivary stone. When you eat something acidic or spicy, your salivary gland secretes saliva. This can cause an inflamed or blocked duct to hurt.Generally, this issue resolves on its own over several days. If it does not, consult with your dentist. He may suggest a minor procedure, such as massaging the area if he feels there is a salivary blockage. Rinsing with warm water and a teaspoon of salt can help sooth the inflammation.
Try not to be overly concerned - a red spot in this area alone does not sound at all serious in nature.
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