Sore feet (bunions)

I have been buying shoes and experimenting with socks.
Winter seems to have damaged my feet: there are strange red spots in some places, and callusses and blisters forming on my inner left heel and the bunions on both feet, but worse on the left.
I am heading to Bonaire next week, so hope to be barefoot, underwater, and/or exposed to sunshine.
I see Dr. Dossetor at the end of May.