To be fair, DR, tekn0m0nk wasn't talking about post work painting, but rather making the bruise as a texture file, which you apply in the material room as a shader tree, instead of the algorithmic shader tree I supplied. This is still pre-render and would not have to be done over and over again like post work.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)