My partner spilt dirty garden water on his groin area .Aweek later has a rash both sides red and purple and itches.

Partner spilt dirty garden water on groin now has rash both sides red lookes brused and itches spredding down leg

Wash it twice a day with soap and water, and DRY the areas thoroughly. Keep the area DRY by whatever means you can.

Put a call into your physician and tell the nurse the problem and see what the doctor tells you.