A red tongue may be caused by stained moss. Clinically, red moss usually does not appear as such a manifestation. However, red tongue is often present, representing heat evidence. Dyeing of the moss can occur by consuming foods with coloring. For example, eating red hearted dragon fruit may result in red tongue coating. Clinical moss color has white moss, yellow moss, gray and black moss, usually not see red moss. And the tongue will have red color appears. Generally represents heat evidence. There are solid heat and deficiency heat. Tongue color is slightly red or only the tip of the tongue is slightly red, mostly on behalf of the external wind heat; and the tongue body is not small, bright red color, mostly internal solid heat; if the tongue edge is red on behalf of the liver and gallbladder have heat; the tip of the tongue is bright red on behalf of the heart fire on the inflammation. In addition, a small tongue, a bright red tongue with little or no moss, or a cracked tongue that is bright red with no moss, is an evidence of deficiency heat. If you feel unwell, please consult a doctor immediately and take medication under the guidance of a professional physician, do not take medication blindly on your own to avoid delaying the condition or producing adverse reactions.