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.
Moisture on your skin is a frequent cause of a blood blister because blisters form easier on moist skin. Prevent blood blisters by keeping your skin dry -- especially on your feet. Wear socks that are specifically made to absorb moisture and provide plenty of cushioning.recautions to Take With Blood Blisters. 1  Never break the skin around the blood blister; it will heal naturally with no scarring. 2  This is the first thing that you should remember if you get a blood blister. 3  People often pop a blood blister and itâs the most common mistake made.