Been cutting the whole leaf when I find this ! Plant is strong and healthy tho.
I’m thinking it’s a calcium deficiency
Check underside of leaf for egg sacks
@Firsttime71 do you see any bugs in your soil or under the leaves eggs as @PharmerBob mentioned?
It looks like bugs to me. As long as you have a while till harvest I would wash it 
Like the others said.
No bugs or eggs found. Added some calmag and we will see