They have only shown up on the one plant the rest seem to be perfectly fine (they aren’t raised and are more of an indentation)
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Could be the start of mag or potassium deficiencies. How old are your girls ?
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A little over 3 weeks old autoflowers
Are you feeding nutes? Lighting? Soil?
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70% fox farm ocean forest 30% perlite in 5 gallon pots they were fed 33% of the feeding chart on fox farm grow big at 2.5 weeks and again just this weekend with a regular water inbetween and for lighting a 1500watt led on veg setting. Also thank you for your reply ive been googling my lil heart out and couldn’t find anything that resembled the spotting.
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Looks like splash burn from top feeding.
Did you drip some water on the leaves 
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The FFOF medium is pre amended with enough nutrients to feed the plant for approximately 6 weeks with PHd water only. I would also start watering to at least 20% run off and testing the PPMs and start feeding nutrients when that number is around 900-1000. Run off will also help keep a healthy root zone and test the PH of this as well. Plants look great Growmie
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I was wondering if it could have been that. but i know i dripped some of the feed water on the ones around it too but they showed no signs of spotting so i wrote that off. I appreciate your replies and ill back off the feeding and check the run off on the next water to see where the ppm is at
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FF no need to feed for a few weeks. Already has enuf nutes. Spots look like a little water got splashed.
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@Kazoo Welcome to the community, my guess is it’s from the water splash, but you may want to keep a close eye on them and make sure the spots don’t keep getting larger, if so it would be a fungus Disease which can be treated.
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Welcome @Kazoo
Even though they are very young and it is unlikely, I suggest you also check the undersides for signs of pests. Do a slow thorough inspection with a magnifying glass.
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