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.
Scabs on scalp when picked off clear liquid oozes out then blood comes out , then scab comes back thicker? thick scab forms on top of scalp it is ithcy. when i pick the scab off clear liquid comes out first then blood and a thicker and bigger scab comes back its reaccurring I had it for well over ten years on and off. Please help my sore head. Follow. 10 answers 10.