hi,thanx for your query. reasons for scalded tongue are :nutritional deficiency,oral candidiasis a fungal infection of mouth,diabetes,anxiety,depression. this small lump on right side of neck is a lymph node swelling ,might be due to infection.soreness in right lower jaw might be because of infection to sub mandibular salivary gland.burning mouth can be treated by sipping fluids in regular intervals , use of alcohol free mouthwash,making changes in diet and lifestyle,spicy ,hot & acidic food should be avoided.a very simple and tasty medicine is mixing honey with milk and coating the tongue with the mixture.identifying the cause of the disorder is the key to starting the right course of treatment recommended for this condition. hope this is helpful.