Ouchie! Just a few more questions.
The blisters are mostly between your fingers? Is that along the length of the finger, where they touch each other if you were to make a fist.
Or mor at the base base of the fingers where they meet the palm (eg where your webbing would start if you were from Atlantis).
Also, try a bit of talculm powder wherever the blisters tend to start AFTER they've fully healed, in case it's a friction-based blister.
Photo's of both your blisters and the fans themselves and how you hold them, would be very useful, as there are so many factors that could be at play here...
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