Sounds like you are not really flaring, you just have inflamation, but that your GI is hoping to nip it early. If it's not bothering you...maybe you could avoid the prednisone. But I know I am sure grateful for it when I'm flaring badly, because it works. My side effects, over many years, have always been temporary.
49 year old female attorney, diagnosed UC/pancolitis 1985, no surgery but much suffering.
Asacol/5ASA 6x400 mg maintenance for 20+ years; use prednisone & Rowasa for flares.
August 2008 sought care of naturopathic doctor. Food sensitivity test showed wheat/gluten, other intolerances; started diet without gluten, soy, dairy, tomato etc. Replete$$ probiotic powder, then Forte, now a stronger one (50 billion). Doing much better, but still having some bad days.