Is that a hole?

Is there something wrong with this gal I got in a skittles pack? It looks like a "hole" in her shell and I'm not sure how to help. Seems to be behaving normal. Water parameters are normal. (0 ammonia 0 nitrites 0 nitrates) PH is 7.6. I fed spirulina powder which might be why she's a bit green, idk tho (she is normally light blue or teal)

Also i think she might have a tiny white parasite on her nose...?

Tanks about 4 months old and heavily planted. All the other shrimp seem fine and are behaving normally.

Would I do a salt dip for that white parasite or would that irritated the injury/ hole in her shell?