Thanks everyone. This has been freaking me out a little (well more than a little lol) but when I checked today it looks like she might have melanoma lumps. Will still have them checked but after a bit more research I have found them to be quite common in my colour horse. The vets recommend leaving them alone as any treatment ie cutting them out or lasering them can release the cells to spread through the system. I will have my vet determine the best approach though. Am so upset that it has taken so long to correct her feet and then I get pregnant and still can't ride her and then this happens.

Good to hear about your horses Stoked, gives me hope.