I have the same exact type spot on a few of my bell peppers. The spots are not on the blossom ends either, but on the sides. Could it be that a bug chewed at those parts and as the fruits developed the spot became rotten? I noticed that my latest peppers, the ones that formed in the last couple weeks, have not had such spots. Maybe those type bugs went away? Just a guess? It looks like I'm going to have a lot of peppers from now until mid-Fall. My plants are starting to really produce. They are about three feet tall and even starting to lean over. I grew peppers for the first time last year and the plants didn't really pump out the peppers until late summer and early fall. At least something grows well in Texas. Pete

It is called Blossom End Rot (BER). Lots of info available here on it including a FAQ. Dave Here is a link that might be useful: BER FAQ

So...here I am thinking I had gotten bad plants or blossom end-rot... turns out I have "RED WING BLACKBIRDS"!!! Little bastards have started eating the bottom of the peppers just when they get big enough...then the pepper around it turns black. Put a beautiful plant out yesterday with a 1.5" pepper...stayed home from work today, look out in the garden and there a birds on my plants pecking away at the peppers. I don't need calcium...just a pellet gun. j/k Im sure some bird netting will work just fine. Had no idea birds would eat sweet peppers.

I garden in Southwest Florida also, in planting beds and in seven-gallon nursery containers. I've been having trouble growing peppers in the heat in my climate. Part of the trouble is root knot nematodes, which thrive in our subtropical climate. They are especially bad in the summer months in the heat and frequent downpours. Currently I'm fallowing my soil in trash containers for months at a time to reduce their numbers, and rotating with resistant varieties like Wando pea and California Blackeyed Pea number 5. The only pepper I've grown that does well through the summer is Thai Hot. They slow down in the cooler weather and pick up in the heat. I'm testing Marconi this year in my containers, they are reported to be heat tolerant, but I've learned to be skeptical about claims made in seed catalogs. Chilly Chili Hybrid from Tomatogrowers.com is supposed to be "extremely heat tolerant", so they might work. That company is in Southwest Florida, so it might be good info. I tried Carolina Wonder peppers for their reported nematode resistance, and they got devastated by root knot nematodes in my containers. There were hardly any roots at all when I pulled them, just knobby galls. There is no substitute for trial and error under your specific growing conditions. What works in Iowa might not work in The South, as we have both found out. I tried Gypsy, another "heat resistant" pepper. They are all dying and it's only May.