Hi, I experienced this same issue last year, where many of my peppers stopped growing and developed these dark spots. This year I have started to see it appearing on 8 pepper plants purchased from a local nursery. Last year, the majority of plant's that had this were in a bed that was over watered due to sprinkler overspray, but it spread to other plants. I re-used some soil from last year, mix with compost, but I am unsure if that soil was from plants with this disease. The plants have been fertilized with organic granular fertilizer and fish and kelp diluted in a spray bottle. I have pictures of the plants from last year in different stages but here I only included pictures from one plant from this year. This plant has been kept under insect netting and brought inside during cold weather, and has been inside a 5 gallon grow bag for around 1 month. I have some other peppers from the same nursery that are unaffected, and there was no sign of disease when the plants were purchased. I did notice the disease on one plant that is the same variety as the one in the pictures, but was not transplanted and was kept in the original nursery container. Hopefully you have some advice if there are any options for my peppers. Thanks!