Yes - I was diagnosed a couple months ago after continuous bleeding for over a month. The only other symptom I had was body aches. Colonoscopy found moderate active chronic colitis in the rectum - so ulcerative proctitis is now my official diagnosis. Prednisone cleared up my first flare but I am now in the middle of another bleeding flare that started 2 weeks ago.
Blood as your only symptom doesn't necessarily mean it's minor, just that's it most likely limited to the rectum. From my understanding the diarrhea hits when it moves farther up the colon. Unfortunately it seems proctitis can be awfully stubborn to treat so if that is what you have I hope you can get it in remission quickly! Good luck!