You're going on a theory--that if inflammation can occur, the spots may become darker. I'm going on the evidence--that azelaic acid has been tested and found to be helpful for hyperpigmentation http://emedicine.medscape.com/article/1068640-treatment (see 2nd paragraph from the bottom) and for inflammatory skin conditions ( http://www.ncbi.nlm.nih.gov/pubmed/20545756 ; http://www.ncbi.nlm.nih.gov/pubmed/20967185 ).
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