I just found out Chloe has cutaneous mucinosis. I saw the spot on her leg and investigated, she has the bubbles on her legs and neck. The two front legs seem to be the only ones that are opening. I've included a video of Chloe and shows a close up of the affected areas. Also I've included some links with info on CM.
(oh and that burp in the middle of the video ... that was Rinaldo, what a pig eh! LOL)
Dr Vidt has a lot of info on it HERE
and this website seem to have some good info HERE