purple pea sized bubble?

[conodor]

On a rock i was given it has 2 or 3 bright purple pea sized bubbles on them. i was looking once and they it pulsated. If you lightly tap the glass it will like puff almost.
There's 2 about 2 inches apart. one has 2 white dots on it. and they both have kinda like a mouth on the very top. i guess it kinda looks like a pea sized ballon. and the mouth is the knot.
I can get a picture if needed but lets see if someone knows the name first.
THANKS! and back to newbiing!

 

[spanko]

Do need a picture but sounds like maybe red bubble algae.

 

[conodor]

did some fast reading it sounds like this may be it. it just such purple color and the 2 ear looking things. confused me
the 2 ear looking things kinda looks like shreik's ears.haha
i have a picture uploading now it should be here in a few. problem is they are so small and there's only 3. i forgot about one other one.

what a bad pick. it's hard to even see them. just purple dots in this photo.haha