My tongue has about a dozen little blisters on the underside. The doctor knows what it looks like (herpes) but it isn't accompanied by any of the other, usually more common, symptoms (e.g. a cold sore). The tests come back on Monday. Meanwhile it's plenty of fluids and antiviral drugs for me and distant social contact. It feels like I've bitten my tongue quite hard just a few miutes ago.
(Also, it doesn't look like the pictures on the Internet. Take note, Internet dependent self-diagnosticians.)