Help to ID these lesions on my peppers?

[MSchep]

Hey All,
Any help in identifying what is happening to my peppers would be much appreciated. I keep getting these decaying lesions on my peppers just shortly before they reach maturity. First pic is from just now, the first jalapeno I was hoping to harvest this season. The other two are from later in the season last year, but I got distracted by other issues and forgot to ask for help here.

What am I dealing with, and how do I address? The plants are completely healthy otherwise. I'm growing in self irrigating 5gal buckets, with new planting mix this year (Raybo's 3-2-1 recipe), so my gut says it is pest-related, but I can't find any other than the occasional aphid/thrip/etc.

Thanks in advance!!!