A popular commodity for multiple uses in days gone by, leaving it to ferment a little would allow the urea to convert to ammonia and then it was gargle time.
We can be very thankful modern medicine has brought haemorrhoid cream to market, as one of the previous options was a quick visit to the local doctor to have a hot iron removed from the coals, and then the procedure (we can spare the details!)
Treating one disease with another sounds like a bad idea, probably because it is, but one Austrian man didn't let that stop him when he realised malaria fever could be used to rid a patient of syphilis. However, one of the unfortunate side effects of malaria was that the patients sometimes died. Not an ideal outcome.
Look out if you had asthma in the 1740s and didn't like carrots - one treatment thrown about for asthmatics in that time was a fortnight on a diet of only boiled carrots. Perhaps not great for asthma, but a surefire way to lose a little weight.
If dry, chapped hands were what ailed you, one possible solution was to take a tub of sour cream, wrap it in a cloth, bury it for a day then dig it up and apply generously.
With the cost of dairy products these days it would probably be cheaper to grab yourself a nice moisturiser. Yes, it's a fact many of us may be a little ill, but thank goodness for modern solutions!