Lots of rain lately here. Has it rained a lot where you are?
It looks fungal to me. Caused by lots of reasons, but mainly moist and crowded conditions with low air flow.
How many plants are in that hole? If it's more than 1, you'll need to cut the extras away.
I would remove the damaged leaves, and clean your scissors and hands before you move to other plants. You can use neem oil weekly as a preventative.
USDA Zone 7b/ Sunset Zone 31