I have a small hard knot like having in roof of the mouth right side its small its not healing from one and half month does its a oral cancer why its came for me I am worrying about this can any one help mee plss its hard and small in the roof of the mouth its in right side we can not see that it is with skin colour when I touch with my touch it I see that hard knot pls any one help me is this oral cancer or something any one pls help me and can any one gve me some medicines to heal this.