I had a hysterectomy in Dec. 2013.

 it was done laproscopic. Shortley after  that  I started to get blisters and draining from my navel. Now I am still having this problem, but these blisters keep popping up all around the oustde of belly. I have been to dermatoligist, to no avail, but to keep putting prescribed ointments. I am on the third different type.of ointment. Has anyone the answer to this? I am at my wits end. I am still getting blisters and they are sore.