Last year, I found some brown spots on some of my pepper plants. I couldn't see any insects so I trimmed the affected parts quite aggressively. The plant survived the operation quite well and proceeded to grow and fruit.
Unfortunately, I've recently started seeing similar scars along the veins on the same plant. I've given it a thorough inspection and found a handful of these critters:
What are they? Can they be the cause of my pepper's scarring? How do I get rid of them?