I don't know what causes it but I've noticed this many times in habs. Usually a small green ball-shaped thing. There doesn't seem to be any rhyme or reason to it so you can't tell without cutting it open. They taste very green, but usually with lots of heat (proximity to placenta?) Jeff > I have seen that many times in various bell peppers, and more > recently in my Arledge Hots chiles, but not yet in a hab.