Dark spots and how to fix

Hi all, can anyone tell me what these dark spots are and how to fix it? Thanks

Here ya go this may help ya out till the pros chime in.

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What type of medium u using? Ph? Ppms? Also can we get a pic of whole plant.

Interested to see where you’re at in the grow - I’m assuming mid to late flower?

Mid to late flower. It’s happening to 3 different strain all at the same point of flower. I ph my water at 5.9-6.1. I use promix hp

I’ll take a pic of the plant tonight when the lights are on