hi- i have recently been diagnosed with RA and started MTX just over 6 weeks ago. I have developed little red lumps on my thumbs and fingers, which look like blisters, or spots but without a head, and are a bit tender to touch. They seem to be where I would be touching things such as bottle tops or tablet blister packs; I started with one and now have 8 of them. I've never had these before and RA consultant yesterday did not know what was causing them. Can being on MTX or having RA make you more allergic to things?