Sudden Breakout Of Lumpy, Hot, Itchy Rashes On Face, Legs, Arms Usually With Elevated BP. Possible Problem In Gallbladder?

Hello...I have not been able to pinpoint the reason I break out into a lumpy rash on face, legs, arms. It happens mainly in the morning, after I ve gone for a walk and, I would assume, after my blood pressure has been elevated. The rash on my face has a welty look to it and the rash on my extremities are smaller bumps. Both rashes are hot and itchy and last for anywhere from two hours on my extremities to all day and into the evening for my face. I ve tried to narrow it down by removing and then re-introducing different foods....eggs, soy, gluten, fat but the reaction is inconsistent. There does seem to be a greater reaction with fat, but not always. Does gallbladder problems produce rash? Liver? Help! This has been going on for over a year....