I have one, it feels like a slug! It is about 2 cm long and 1/2 cm wide. It has beeen scanned! And looks like a stiffed kidney shape, I asked to have a look.
But it pulls when I move too much! And tingles too.
Sorry you haven’t had any replies to your question as yet, but hopefully someone will see it now. In the meantime our helpline staff will be only too happy to talk to you about this. Lines are open weekdays 9- and Sat 10-2. 0808 800 6000