Phal leaves pitted and some small brown hard blisters

[byngga]

Some great advice - and many thanks for encouraging words.
I think it could well be the 'blister' thing because they don't seem to scrape off easily... seems to damage the leaf if I do get em off and ooze sap... was it that I used cold water rather than room temperature? It did seem to happen soon after I gave the pot a good soaking in cold water and left it a little longer than I should (forgot I'd left it to soak and it was about 24 hours with the pot immersed in water).

It definitely didn't have the 'scarred/pitted' areas when I 1st got it. They are just appearing on the top surface of the 2 biggest and oldest leaves (underside of leaves looks to be fine) and now that I've spotted them I'm not sure if they are worsening any more... I'm looking at it every day so maybe I'll have to leave it a week or so and compare with the photos.

I thought a spray of insecticide couldn't do any harm Wish there was a 'cure all' - any suggestions for mites / virus?