This caterpillar sting, if severe enough, a rather crushing contact with injections of several spines will produce severe pain. The positive is that after several hours of pain you may be releaved of pain. If you are suffering from arthritis and you crush one of these near the affected joint you will see a noticeable reduction in swelling and pain from the affected joint. Long term relief is possible. Pain free for 2-3 years. If you got the guts to endure the pain from this one.