It sounds as though your peppers may have bacterial spot. This disease affects leaves and fruit and develops in moist weather. On the pepper fruits, bacterial spot appears first as small, water-soaked areas. Eventually the spots become dark, raised, and scablike. On the leaves, spots first show up as small, irregular, water-soaked areas on the lower leaf surface. They turn purplish gray with a black center. If leaf spots are numerous, they can cause the leaves to yellow and fall from the plant. Peppers on defoliated plants may develop sunscald. This disease usually comes from infected transplants. Make certain that you purchase plants from a reputable supplier. Bacterial spot spreads through splashing water, or by the gardener working among wet plants. Avoid wetting the plants' foliage when watering, and wait until the plants dry to work in the garden. Destroy affected plants at season's end, and plant peppers in a different location next season to prevent the disease from carrying over.