Trust me, I get it. The first time I had chicks and I saw one flop over to dust bath, I thought it was dying. You'll never stop being surprised and worried over your chickens.
You don't have anything to worry about. That is either normal coloration happening, or perhaps a tiny nick. Combs bleed shockingly heavily even for teensy scratches, and the scabs will look like black dots. Sorry, I couldn't see too clearly the dots in your picture, but again, everything appears...