your pictures aren't all that clear, it looks like some sort off mould but, from what you have said it could be genetics. you should try to get close up clearer pictures and no doubt someone will have the anwser you are looking for.
gavmac3777 Reviewed by gavmac3777 on . What is this? Clones Outdoors Moisture plus potting soil mixed with old compost. Stoped nutes because I thought they may be causing this, water from rain barrell. Used bloom booster when I first noticed buds, but stopped 3-4 weeks ago, not on all parts of plants, some areas not affected. 3 out of 4 clones from same person has this, theirs does too. It just does not look right and it seems to be stunting the buds. Plants from seeds right beside this has no signs of the darkness. Advice please, Rating: 5