Lavender. hmmm. I looovvve lavender in the garden or dried in a bag in my wardrobe, but jeez, its got some associations for me. Old ladies. I guess that's us, huh? I can't afford proper essential oils and the cheap ones always smell rancid after a day or so.
Bloss, have you tried some antifungal cream? Looking at those little pustules, it could be a "thing" which crops up when the Herceptin kicks in, maybe a bit like happens with thrush during chemo. Frankly, Im just guessing, but this shit is infuriating. It would be interesting to do a totally unscientific trial with a sample of one treated knees and one untreated. Mxx