@majjy_rane It's hard to say without actually being there. I was looking underneath for signs of insects.
Do you have a jewelers loop? It things were crawling around you'd see them moving right away with some magnification. Could be something growing on your plants too, like PM or powdery mildew.
When it is me, I look first for simple things that I've messed up, things that I can fix. Symptoms and causes... can be two different things. How is the environment? What are your humidity and temperature? How's the media, wet, or dry? Have you got EXCELLENT air flow?
Check out this thread:
https://www.rollitup.org/t/guide-for-diagnosing-plant-problems.38772/
And here:
https://www.growweedeasy.com/cannabis-symptoms-pictures
Good luck!!