1 cm purple halo around quad injection site?

OK yesterday was my last shot of prop/tren, into upper outer quad. I always use good injection technique and this last one was no exception, everything went as usual. However this afternoon I see there is a little purple spot there and a little scab over the hole.

This has never happened before, all I can think of is that I didn't hold the prep pad on the wound long enough to completely clot and the site bruised up. No redness, no soreness, no lump.

Anyone had this happen?

Yes... it is called a bruise.