Thanks for using Health Care magic. Read your query. Roof of the mouth or the palate can become sore or it can develop a burning sensation due to may causes which can include drinking or eating hot foods excessively,spicy foods,canker sores ,throat infections or any tooth problems. * Since you have a history of cold and cough ,this could have triggered the formation of this lesion. I would advice you to get your throat infection checked with the ENT surgeon and have it treated .Avoid too much of over the counter medicines. Avoid spicy and hot foods .Avoid irritating the lesions by using toothpicks or by hard brushing. Apply a dentogel /mucopain gel on the lesion two or three times a day, Take nutritious food and lead a stress free life. Hope this was helpful. Thanks and regards.