haaka pain

I have been using haaka for a while and now it starts to hurt at skin where the flange are. My nipple and areola are not pain at all, but the skin is. Why and how to avoid this pain?? Only the pectoral muscle skin is painful, the other skin at the suction point is not painful. Why and how to avoid? It is painful to the extend that I give up haaka after 5 min. Is it because I have clogged ducts at those area?? Please help!!