Hello Lorraine and welcome to the forum. How long have you had the bleeding again? Have you informed you GI about it? Are you having other symptoms along with this? What meds are you on for your crohns? When was the last time any tests were done to check on how things are doing inside?
Sorry for all the questions hun but some further info will help us to point you in the right direction.
Like Angrybird above, I wonder if you've discussed this with your gastroenterologist? It may be time to change your treatment regimen so it's best to discuss this with them.