I have a diagnosis of diverticulosis and have had 1 episode of diverticulitis severe enough to be treated with antibiotics. I'm am currently experiencing the same, but milder, discomfort in the same area, mainly just when I take a deep breath. This morning I noticed I have a slightly raised red rash, not itchy, that seems to accompany the diverticulitis. It's on very specific parts of my body; the same places each time. I can't find any reference to it on-line. It usually goes away when the gut pain does. Have you ever heard of this before? My GP thought it was a reaction to the antibiotics when I had it the first time, but I haven't had any treatment in the subsequent, milder episodes.