blossom end rot
although i've never experienced or heard of it, are peppers susceptible to blossom end rot as are their nightshade cousins tomatoes? this month i began having many peppers with bottom rot. any other possibilities?
This condition typically occurs early in the season, and more often with tomatoes, but, yes, it can affect peppers as well as other produce such as squash and watermelon. It's a calcium deficiency, so you may want to get your soil tested and add lime if called for now or next spring. Next spring you also could stir a handful of calcium into each transplant planting hole.
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Pull off affected peppers. You still have time for more (of some varieties) to grow.