Yellow spots

Hi all just started growing and starting to become a big fan it's a great hobby but I have a question for all you pros I am getting yellow spots on some of my lower leaves my plants are 3 week into flowering the yellow spots have been there since week 1 of flowering but they don't seem to be spreading and they seem to be only on the odd one or two plants and only the lower leavers and another question am working in a tight space and the plants are beginning to get bigger than I first thought so I have bunched them all together how will this affect my plants? Ty and I hope for a reply

got some pics?? without them all were doing is guessing.

Yeah will post some soon

yellow/brown discolouring of the lower leaves usually is a nutrient or PH issue. Without pics it's very hard to give you a proper answer.

Ok these are the photos the one on the piece of wood I have just found now I cut this leaf of around 3 minutes ago the leave on the wood was near the top of the plant if this is mute burn suggestions on what to do

what kind of light you running? the second pic looks burned maybe. how close is you light?

I thought that myself so I've just raised the lights they was close. What would you say the first leaf is? Nute burn ?

no I wouldn't say nute burn. do you happen to have any gnats flying around?

My plant started like that now I figure out cal/mag def