Carrie has a clean bill of health!

The vet feared that her bruising might have been caused by a specific type
of tumour, and took tissue samples for analysis.  Nothing.  It was purely
bruising.  She spends a lot of time on one windowsill, and might have fallen
in a tussle with Bertie- we've come home before to find the various other
items on that sill on the floor, so there's every chance that she may have
come down with them, and landed on one.  Not hard enough to cause wounds,
but enough to bruise.

She's just finishing up the last of her breakfast and having a really good
wash.

Thanks to everyone for the purrs - they worked!