Can a ultrasound see if I have sis inside my vagina?

What is "sis"? A cyst?

Considering what a cyst is and how an ultrasound is, yes it should be able to.

Why are you asking this question?

Yes, an ultrasound should be able to see a cyst, especially if you had a transvaginal ultrasound.

Have you had an ultrasound? Why exactly are you asking this question?

Also, I really hope you don't have a "sis" in your vagina, that would be creepy.

When I curiosly touch my cervix inside my vagina I felt something inside.it was like a pimple,it's a little bit big just like a haft of small monggo beans.. is it dangerous? A cyst?

How can you reach your cervix to touch it? Why are you sticking your fingers inside yourself??

The only way to find out if this is a cyst is to have a doctor check.

When I curiosly touch my cervix

Why are you trying to "touch" your cervix?