1 An adenoma is a part of the gland that has walled itself off from the rest of the gland, forming noncancerous (benign) lumps that may cause an enlargement of the thyroid. Not all adenomas produce excess T-4, and doctors aren't sure what causes some to begin producing too much hormone.  Thyroiditis.
Scratching Itchy Skin Causes Brain To Release Hormone Serotonin, Intensifies Itchy Sensation. While a good scratch may temporarily relieve you of your itch, it actually stimulates serotonin in the brain that intensifies the itchy feeling.
Additionally, a high level of histamine has been found in healing skin and scabs, which we know will create the sensation of itching. During an injury (especially a burn), nerves may have been damaged, creating inappropriate signals that the brain interprets as itch. Oil glands may also be damaged by injury, and dry skin is itchy. This is why it is recommended to keep healing skin clean, covered, and moist with petroleum jelly.