
What Do Pus Filled Blister On The Palm Indicate?

Emergency
Detailed Answer:
This is a medical emergency and he must be taken to the ER immediately.
There could be an impeding gangrene in his hand with the matter compounded by the stagnation of blood flow due to congestive heart failure.
I am sorry to note he refuses to go to the hospital. But he is risking his arm and life.
There is a very small chance it may not turn out to be as life or limb-threatening as I have described above but nonetheless it deserves immediate medical attention and treatment to prevent it from progressing rapidly to an advanced stage where it will endanger his life, and salvaging the arm/hand will become difficult.
Of course his diabetes also needs to be very well controlled to assist quick healing.


Follow up
Detailed Answer:
There is no attached photo for review.
There are 2 types of gangrene, dry and wet. The former can be cold especially when circulation to the area is compromised. Wet one is typically infected and hot. Both have ominous consequences if not attended to promptly

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