I only have four contacts on Skype but my a/c had a left hand column with
About 40 contacts and each came from China, Russia, and every country
You can think of. I couldn't delete them (I/m not computer literate) but I
Did find I could block them so I blocked them all, one at a time.
Should I be worried.

No, you should not be worried. That happens all the time.

Thank you. I really was worried.

I had the same problem. Just blocked them