What is this??

I just noticed this on my 6 year old GSD lower back leg. At first I thought it was a tick but it’s a small soft cyst of some sort? Any advice or knowledge would be good. I’ll be taking her to the vet during the week. Thank you in advance

I just noticed this on my 6 year old GSD lower back leg. At first I thought it was a tick but it’s a small soft cyst of some sort? Any advice or knowledge would be good. I’ll be taking her to the vet during the week. Thank you in advance