Can't see.
Are they black or are they violet?
If they are violet, not a problem.
If they are black, might be too cold. What is the temperature where it is growing? These like it on the warmer side (60 F - 85 F/15.6 C - 29.4).
I recommend getting a simple and cheap jeweler's loupe with the highest magnification you can find (something like this:
https://www.ebay.com/i/192727089454?chn=ps or this:
25mm Magnifying 40X Magnifier Glass Jeweler Eye Jewelry Loupe Loop LED 7295891022092 | eBay) and look to see if they are black spots or if they have pitting. Black spots along with pitting is also not good.