Or is it a bacterial/viral infection causing the itchiness to propagate?
In: Biology
Injured cells and the cells that do the work of healing release molecules called cytokines to communicate with each other so that the right cells are doing the right things at the right time. These are the same kinds of things of molecules you hear about in “cytokine storm” that can be such an problem in Covid infections. Sometimes the effects of these chemicals are useful, sometimes they are annoying. Histamine, for example, might help you to get rid of something irritating by sneezing or scratching, but the itchiness might also be annoying in a healing wound. Also, when blood in an old wound or bruise breaks down, it becomes bilirubin, which just happens to be something really itchy.
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