One bad spot need advice

Need some advice guys. I'm doing an PC grow with two autos. My larger plant has two spots now. The small one was from a few days ago now another leaf has a big one and the tip is about to fall off. That big spot just appeared overnight. They are 16 days old. I gave nutes for the first time on day 15 (just 1ml of biogrow, 500ml water). The small spot showed up on day 14 prior to any nutes but hasn't gotten much bigger. What could be the problem?

Looks like a droplet of the feeding solution you gave them got on the leaf and caused what is known as a "nute splash". get yourself a watering container with a spout if you dont already have one to avoid the solution from getting on the vegetation. keep an eye on the plant but i really think it is no big deal

Okay I just read to where you said the smaller one appeared before given any nutes. so not sure on that one.

Yeah, looks like a bit of nute burn, as airborne said, likely a droplet of nute, no big deal, ease them into nutes and keep the splashing in check when watering you'll be fine.

Alright, thanks guys. I will keep an eye on them. Thanks!