Bugger Bugger Bigger .... I am so sorry to hear of this development @LITHGOW1950 ! Most unusual & so scary!!
I had a really weird 'rash' last Fri night that I almost thought was Meningococcal Disease ..... it didn't break the skin, but it was purple spots with bigger splotches around & thru it. I was really spooked & kept awake all night, checking it (and my torso) for signs of spread! Scared the shit out of me!! I was out of phone range of ANYTHING so couldn't even have called for ambulance help if I needed!! I 'circled' the area with a pen, to keep an eye on it - and it didn't 'grow' .... I can still see the marks but it is getting fainter by the day!
All the best for you chemo ..... I hope it fixes the problem xxxx