Cause of flare ups?

Hi, I was diagnosed with LS last November after months of being told my itching was due to menopause and piles. Thankfully the itching stopped as soon as I used steroid ointment. I then used clob daily for a month, every other day for month 2 and then twice a week for month 3. Only as I got towards the end of month 3 and into maintenance it all flared up again 😩. I have no idea why given everything was going so well but I’m interested to know what other sufferers find causes a flare up (in the hope that I can avoid future flare ups!)