My 36-year-old Brother Just Had A Colonoscopy Today And While They Didn't Find Polyps, They Found 2 Red Spots. Also, When They Went Down His Throat, His Stomach And Lower Intestine Had Red Spots. What Could It Be?

My 61-year-old father had 2 polyps the size of quarters removed last year that were precancerous. My 40-year-old brother just had one last month and it was clear. My 61-year-old mother had a colonoscopy last month and there were a few very small polyps that they are not checking again for 5 years. My brother also has lost 40 pounds in the last 3-4 months without any major diet changes. He also has sleep apnea. Just wondering what this could be.