No as a midwife can't say I have heard of this or seen it either. Interesting. I have certainly seen blotches and the skin doing funny things but not to that description. Probably a good place to get it if you were going to get it IYKWIM. Guess by the sounds of things its only cosmetic and not irritating so should be ok. I am sure what ever it is it should go away after the birth of bub.