The Stinging Jinx causes severe pain and swelling to the victim. The effects is a burst of white light (DH23).
References from the canon
Hermione fired off a Stinging Jinx directly into Harry's face when they were accosted by Snatchers. The resulting swelling disfigured his face to much that he was unrecognizable.
The spell may be related to the Stinging Hex which Harry inadvertently fired at Snape during Occlumency lessons (OP24).