SOIL What is the health issue on this leaf?

[2by4Rich]

Today I found one leaf with these whitish marks but they are not rounded like the fungus septoria presents itself (See attached photo of the leaf).
1. I have been careful with the PH in every watering always 6.20.
2. The Humidity has been very well controlled targeting 45% because my Gorilla Glue is Flowering (18 days).
3. Temp well controlled between 72 F and 82 F.
I am thinking of spraying Neem Oil on the leaves not on the flowers.
I have attached a photo of the leaf with the marks and one where it shows it is flowering.m (See 2nd photo to see the flowering stage)
Anyone has seen this before? What should I do?
btw, I checked the Health Plat guide at growweedeasy https://www.growweedeasy.com/cannabis-symptoms-pictures
​Any help will be appreciated. Thanks in advance.

 

[Bluey]

Maybe thrips. Spray with soapy water works if it is them.

 

[2by4Rich]

Thank you Bluey!!! Fyi, i did check the leaf on both sides with a 60x magnifier and there were no insects. I did find that a PH issue and insufficient Calcium looks similar to my leaf. I was aiming for ph 6.2 but i will aim now for 6.5.
Fyi, i will remain vigilant and if I see any Insects, i will spray soapy water and Neem Oil. Thank you for replying!!