Prednisone did it to me. Lots of random brusing and some of them were pretty nasty. Got better as I lowered my dosage. You should check with your doctor though as its not something to mess around with.
Dx with Crohn's Colitis July 2007
37 yr old working Mom with two beautiful little girls (2 and 4)
Prednisone (20mg), 50 mg Mercaptopurine (6MP), 4.8g Asacol, Vicadin, Imitrex and Ambien as needed
Other stuff: probiotics and folic acid