1 Cold sores later crust over with a scab and are usually associated with tingling, tenderness, or burning before the actual sores appear. 2  Mouth irritation. 3  The irritation can be caused by: 4  Biting your cheek, tongue, or lip. 5  Wearing braces or another type of dental apparatus, or having a sharp, broken tooth.
Main Image: The Pituitary gland is a pea-sized endocrine (hormone-producing) gland weighing about 0.5 g situated at the bottom of the skull sandwiched between the optic nerves, in humans. The pituitary gland secretes hormones. Hormones are chemicals that travel through the blood stream.
Pineal gland hormones include melatonin and ramelteon (Rozerem). How pineal gland hormones work. Melatonin is a hormone produced by the pineal gland (located in the brain) during the dark hours of the day-night cycle (circadian rhythm).Melatonin levels in the body are low during daylight hours. The pineal gland responds to darkness by increasing melatonin levels in the body.elatonin is a hormone produced by the pineal gland (located in the brain) during the dark hours of the day-night cycle (circadian rhythm). Melatonin levels in the body are low during daylight hours. The pineal gland responds to darkness by increasing melatonin levels in the body.