Skin has three layers: 1  The epidermis, the outermost layer of skin, provides a waterproof barrier and creates our skin tone. 2  The dermis, beneath the epidermis, contains tough connective tissue, hair follicles, and sweat glands. 3  The deeper subcutaneous tissue (hypodermis) is made of fat and connective tissue.
1 Your guide may recommend the application of butter or ghee to draw out and lengthen your tongue. At this point, your tongue should be long enough to reach the center of your eyebrows.  Even with a guide, Kechari Mudra may take months or years to master.
Your tongue can also swell and burn due to certain types of anemia, such as seen with iron deficiency and vitamin B12 deficiency. The condition may also be as a result of other factors, such as general lifestyle, diet, allergies and other environmental factors. It might also be as a result of ingesting hot foods or drinking overly hot drinks as this can physically burn the tongue and cause long-lasting irritation.