I feel that long term steroids is not a suitable therapy in any form, including topical. I have had patients who used topical Steroid/Antibiotic combinations with good success for acne control, but suffered from thinning and sensitive skin.
I would suggest instead that you get reviewed for your cystic acne condition as its unusual that it reacted so well to steroids. Is it other inflammatory conditions that LOOK like cystic acne?
Wishing you the best!
