hello , i have been using an omnipod patch pump for about 7 years 5 and a half on pork insulin and for a year and a half on novorapid . Until the last month I have had little problem with lumps where the canula was. I have been using the omnipod on my arms and recently j have hard lumps that are a bit painful . I have put the last 2 at the top of my bottom , an area I havnt used before but am still getting the lumps . Can you develop a reaction to the Canulas ?