Hi, my 13 month old child having recurrent ulcers on upper surface of her tongue,which appears as one or two tiny rd spots which gradually increases in size & then disappear after 1 or 2 weeks,this happens 4 times since last 2 months. she is a thumb sucker. acc to GP its aphthous ulcer , I want to know why its appearing again & again , what should be remedy or is there any way to stop them. Thanks.