Saddle sores are serious. Often accompanied by low grade bacterial infections with a secondary fungal component. Recurrent saddle sores can be of the MRSA family of staph. Go to your dermatologist and get a biopsy and culture...

I am posting here a mix that comes from the old west US Cavalry...

Rx: "Shot of (500 grains) Sulfur Powder and a hand full of Bear Grease (4 oz)" - wash sores with soap and water let dry and apply daily. (US Army Surgeon General 1840s)

Today...

Rx: 30 grams (standard shot glass) of Sublimed Sulfur Powder mixed into 4 oz Petrolatum (Vasaline), You can add 1/4 tsp of Camphor Oil to the mix.

Here's a link to some cheap sulfur powder at amazon: Robot Check

This is also the same ointment used for treatment of smelly feet, trench foot, and athlete's foot, just increase the camphor oil to 1 tsp.