These black spots appeared a day or two after it pupated, after I moved the chrysalis. I moved this one before I learned the water trick for loosening them, and it pulled off of its silk. I had to use a dot of glue on the cremaster to keep the thread on. I have done this before with no trouble. The chrysalis appears to have developed normally and it looks like the butterfly will emerge tomorrow. Should I be concerned? It looks like I'll have three butterflies tomorrow, and the chrysalises are all hanging on the same rack.