It is possibly fertilizer burn. A very similar thing occurred on 2 of my eggplants the day after I gave them a very strong feeding.

Jon

Perhaps you could flush the soil with a full watering. Use a dilute compost tea to feed--side dress peppers. Here's a recipe:
http://www.harvestwizard.com/tags/compost%20tea

Here is a link that might be useful: HarvestToTable.com

I was going to say it looked like a nutrient deficiency, so we're thinking along the same lines. It looks nutrient-related, not insect, fungus, or viral.

I am now noticing it on other peppers. I will wait for more input before I try and remedy the situation. I am leaning towards fert burn but do not know what it is yet.

Dale