The OH has done something of immense stupidity (for a change). Chopped chillis, went to the loo now he feels like a very delicate part of his anatomy is on fire. He really is in agony (and I did laugh to start with but now its not funny). I gave him some drapolene cream which you can use to treat minor burns but it made it worse.
Please give me some suggestions as to how I can help him.
I presume he touched the "delicate part" before washing his hands after touching the chillis. You were right to laugh, and carry on laughing. It will die down eventually. Been there, done that, got the T-Shirt.
Make a paste of bicarbonate of soda and water and apply carefully to the affected area. It should neutralise the acidity of the chillis. Or make a more watery solution with the same stuff in a bowl or jug and tell him to dangle his bits in it.