rainburn

From rain +‎ burn, by analogy with sunburn.

rainburn (uncountable)

1. (humorous) A notional burn on the skin caused by excess exposure to heavy rain.
   • 1991 June 13, Mark Grundy, “Plot Seeds/Story: Undead of Purditory”, in rec.games.frp‎ (Usenet):

     It started with neck and upper body sores that looked a bit like rainburn - but usually they had only two or three of them.

   • 2002 May 31, old dobbin, “wild garlic overdose? (long)”, in uk.rec.equestrian‎ (Usenet):

     I have seen sunburn/windburn and 'rainburn' affect horses over the years but this did not fit any of those causes […]

   • 2005, Martin Sketchley, Affinity Trap:

     He peered out, glancing at the sky. 'We'd better get under cover before it starts raining,' he said, breathing heavily. 'We don't want to get rainburn.'

• moonburn