| subcutis | The layer of fat just under the dermis. Also called the subcutaneous layer. |
| t-cells | Lymphocytes produced by the thymus. A part of the immune
system.
|
| telangiectasia | Abnormal, dilated, superficial blood vessel or collection of blood vessels, appearing as a red tracery on the skin. |
| tumor | An overgrowth of tissue. May be cancerous or benign |
| tumor necrosis factor | A substance produced by cells which have come in contact with viruses or tumor cells. It has been shown to kill some tumors, including melanomas. |
| ulceration |
Show the signs of an ulcer: an area of skin where the tissue has eroded. Ulcers are concave, and usually accompanied by pus and necrotic tissue.
|
| UV index | An estimate of the peak amount of ultraviolet rays reaching the earth’s surface at noon. |
| UVA | The longest ultraviolet rays, having a wavelength of 320-400 nanometers. |
| UVB | The shorter ultraviolet rays, having a wavelength of 290-320 nanometers |
| vaccine | A preparation made from live or killed cells and used to
prevent or treat disease by stimulating the immune response.
|
