I had biopsy come back as colonic mucosa with prominent lymphoid aggregate. (found in cecum) i have a family history of colon cancer, years of food intolerances (gluten, dairy, eggs) and ibs. don't have genes for celiac. could this be of concern?

Rather non-specific findings, somewhat typical for the cecal area and aligned to your history of multiple food allergies. Such findings are best interpreted in dynamics and correlating with current symptoms and previous workup and that's why your gastroenterologist remains your best reference at this point as being able to incorporate them in your current clinical context.

All laboratory results need to be interpreted in the clinical context and the doctor who ordered the tests is usually in the best position to do that. Talk to the doctor who ordered the tests. Having said that, the finding you described are within normal limits. Wish you good health!