Elizabeth Martin and Robert Hine. Latest Edition (7 ed.) Fully revised and updated, the sixth edition of this dictionary provides comprehensive coverage of biology, biophysics, and biochemistry, as well as key terms from medicine and palaeontology.
For example, if someone scratches a mole until it bleeds, the resulting lesion, a crust, is now a secondary skin lesion. The most common secondary skin lesions include: 1  crust: a crust, or a scab, is created when dried blood forms over a scratched and irritated skin lesion. 2  ulcer: typically caused by a bacterial infection or physical trauma. 3  scale: patches of skin cells that build up and then fall off the skin.
While a fresh blood stain will be easiest to remove, it is not impossible to remove dried blood stains. 1  Gently brush or scrape off any clotted blood that is not firmly attached to the fabric. 2  Rinse the area with running cold water through the back of the stain to loosen and dissolve the blood. Avoid rinsing through the top of the stain, which can force blood particles deeper into the fabric's fibers. On fabric surfaces that cannot be rinsed, blot the area with cold water.