If your platelets are low, it's pretty common to get
petechiae, which looks like tiny little red dots on the skin (they're not raised nor are they itchy or painful). When my platelets were below 20, I would regularly get them and also larger blood spots under the skin in addition to regular bruising. You should have your doctor check out your rash to be sure though.
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36/F - 1984 SAA treated with ATG [complete remission until] Oct 08 - burst blood vessels in eyes and low platelets; Jan 09 - AA & hypo-MDS; July 09 - BMT (RIC MUD PSCT) July 10 - 10k for Anthony Nolan (1yr post BMT! 53:48) Sep 10 - Wedding!
I've run 5 marathons now!! (PB 3:30!)