No Tim I'm sure I'm the dumb one.
In the Skype for iPad app I see across the top bar, in order, my photo, "tags" , and "Skype contacts ". This then becomes the contact's name when I am on chat.
In the left vertical sidebar, underneath my photo, I see "head and shoulders" icon, (which leads to all the contacts options,) and then the photos of all my recent contacts, then the icon which links to the history page.
I have no items in history and never have had.
The random has tried to contact me. I do not know them but their photo remains in the left sidebar with all my other contacts with whom I have recently chatted. As per my other contacts when I touch the photo their name comes up on the top horizontal bar, but no info at all..
I am unable to clear the left vertical sidebar of any contacts in any way.
As this random person is not in my contacts list I cannot delete them as per deleting an app: I do know how to do that, so I have to delete the whole app and reinstall it.
They have not ever appeared on my computer, only the iPad.
It's no big deal, now, just annoying. And I'm frustrated that I don't seem to get any options appearing when I swipe my finger over the left sidebar.
Sorry, again.....and thanks for trying to help.