I know how that can hurt,
Since a new O ring burst a few months back, causing 2 degree burns after cutting through a insulated leather jacket and a sweat shirt worn under the jacket, we now have the hose encased at the pistol area in Kevlar PLUS have our men wear Kevlar Arm Sleeves along with the leather insulated jacket, a sweatshirt ( Thick), Thermal shirt and a undershirt to protect them from fine leaks of DRY steam. The Leather Gloves, if wet, are used once then thrown away.
We go through 20 to 30+ pairs of gloves every 2 weeks. We buy them in box loads. When leather gets wet or worn, they are useless.
Being that your thumb swelled up that much Russ, maybe you should use Kevlar to protect yourself. I buy them in bulk for about $5 a sleeve for the wand, the one that the guys wear are about $30 each arm. They are made a bit thicker and can handle 500 degrees and will stop the water from penetration into the skin.
Russ, if you want to know where to buy the Kevlar, just give me a call. I will be happy to help.
Something that you may want to look into being that you got hurt this time.
Below is a photo of a burn from just the hose ONLY, no metal, couplers etc., on the skin. And yes, He screamed.