If it were me....I would definitely get it treated....there's some pretty awful things involved with having lymes
disease and I wouldn't take the risk myself...I think I'd almost rather have CD than lyme disease, let alone both....good luck!
Just wanted to add that antibiotics are often used to aid with IBD since we tend to have bacterial overgrowth as IBDers...If you're not already taking a good probiotic daily (to aid with your CD) then I strongly urge you to look into that...most of us that take a probiotic daily, double up on our probiotics when we need to go on antibiotics (key is to take your probiotics at least 2 hours after you're done taking your antis for the day).