Ann, In my limited experience, vasopasms ---ie, Raynaud's phenomenon---- often occur after nursing rather than because of nursing, and the blanching will come and go for no seemingly obvious reason. From what you are describing, the blanching has a very discernible cause, most likely from what baby is doing in his mouth while nursing. A latch can look good and a baby can still traumatize a nipple with unusually strong tongue compression, etc. Have you checked the baby's suck out digitally? Sometimes you can pick this up in this manner. Also, I consider the blistering and other trauma to the nipple to be a dead give away that something mechanical is happening. Hope this helps! -Lisa ****************************************************************************** Lisa A. Marasco, IBCLC / [log in to unmask] International Board Certified Lactation Consultant / [log in to unmask] ******************************************************************************