Debby, Two treatments for cracked nipples that I suggest and have found effective are hydrogen peroxide x 3-4 daily (apply with a q-tip - *drip* it into the cracked, sore area) and saline soaks 3-4 x (mix half teaspoon salt in 2 cups warm water, dunk nipple in for a few mins.) With both treatments, rinse off with plain warm water. These treatments do not produce results if the soreness etc is caused by thrush, however the saline soaks are soothing. The white blister and hx of mastitis and antibiotics suggests thrush which may be secondary to the original cracked nipples. This mother deserves a medal for hanging in so long. Beverley Rae, MSW CSW IBCLC Manhasset, NY