I shave the area myself and make sure they don't bother it. Make sure to keep it dry and clean. Usually, that does the trick, but if not I spray one of the many Hot Spot sprays available.

Hot Spots are so common and very easily treatable without medications, atleast they have been for me so far.

Simba and Nala get them often from being splashed by Kiara and Mufasa by the pool. The water gets trapped and creates a hot spot.