Peppers are like tomatoes - and some other plants - that suffer from blossom end rot. We commonly have that problem with tomatoes, but not all of them. I wonder sometimes if it is the varieties or soil or probably a combination - and ours are all in raised beds or barrels. Never personally had the problem with all kinds of peppers (right next to them sometimes). For me garden lime works well (I use a pelleted version), but I have to keep it up, not just one treatment. I imagine bone meal would be a slower release, but then it wouldn't work as fast - double edged sword there. You really want a fast release, because as others have stated, it won't help fruit already set and growing, but will stop future fruit getting it. I also use Epsom salts, but that is for magnesium deficiency, typically yellowing or black blotches on the leaves, not the fruit. The double edged sword there is high nitrogen fertilizers - which we use a lot of on these plants of course - inhibit their ability to absorb magnesium. So I give my tomatoes and peppers (roses too) a dose of Epsom salts every couple of weeks. I wouldn't worry about the suface texture of your peppers. They can be anywhere from smooth and shiny to all kinds of bumps and wrinkles and warts, etc. Sometimes even supposed smooth varieties do it. They will be just as good to eat. Incidentally, you can cut off the blossom end rot if you need to and use the rest of the tomato or pepper, it won't hurt you. By the way green peppers will often ripen after picking if the are fairly mature - even in the fridge. I learned that after deliberately picking some green and not getting round to using them immediately!