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.
By scalp scabs I assume you mean drying of the scalp with resulting flecking/peeling of the scalp. That routinely happens to all parts of the skin but is more pronounced/obvious when the rate is accelerated/replacement is slow. Or when we dont wash off the deadskin often enough and/or an infection establishes itself in all that compost.