However, the red-yellow pheomelanin is believed to cause the warm, golden, or auburn tones found in some types of brown hair. The range of colors produced by melanins is limited to shades of yellow, brown, red, and black. Grey hairs contain only a few melanin granules, spread out through the hair.
Hormones are your body's chemical messengers. They travel in your bloodstream to tissues or organs. Endocrine glands, which are special groups of cells, make hormones. The major endocrine glands are the pituitary, pineal, thymus, thyroid, adrenal glands, and pancreas. In addition, men produce hormones in their testes and women produce them in their ovaries.
The body reacts in a variety of ways to autoimmune disorders, which cause a personâs immune system to attack its own tissues. Depending on the condition, an autoimmune disorder can affect a variety of organs, joints and muscles, or other bodily tissues. One tissue thatâs commonly affected by autoimmune disorders is the skin. There are many different types of skin-related autoimmune disorders, including scleroderma, psoriasis, dermatomyositis, epidermolysis bullosa, and bullous pemphigoid. Scleroderma.