Leaf Problems on Chilli Peppers
From your picture it looks to me like Odema (also known as dropsy or intumescence), a condition caused by over-watering and / or too higher humidity. The excess water within the plant induces extra cell growth on areas in the leaves (can also appear on stems) and results in the warts / blisters you can see.
The solution should be to reduce watering, and increase ventilation. Maybe try stop misting every morning first.
Hope this puts your mind at rest, and many thanks for your query.
Pest Control Expert