@drtiminaz, It sounds like you have a pretty good plan for tapering off of prednisone and it's going well. I've had the hand cramps but mine are more associated with my carpal tunnel I think. I've not seen the small blisters you are describing but do believe you may be correct about being a side effect of the prednisone. Maybe other members can share their experience. I did find an article that talks about it.

Excerpt from article linked below -- "Long-term use of strong steroids can cause widespread purpura and bruising, normally on extensor surfaces of the hands, arms and thighs. It is caused by atrophy of the collagen fibres supporting blood vessels in the skin. A similar appearance is also found in senile-type purpura."
-- Purpuric Rashes: https://patient.info/doctor/purpuric-rashes

Have you mentioned the symptoms to your primary care doctor? It might be a good idea just to discuss the symptoms with a doctor or pharmacist.