Long lasting blister?

Depends on what you're doing. In order for a blister to heal it needs to stay dry and undisturbed.

 

Put a medicated 'blister pad' on it.

 

How I understand it, you get blisters if there is too much friction and moisture.
That being said, I can suggest from cheapest to most expensive:

1) Tighten your shoes tighter

2) Buy thicker socks
2) Put anti-moisture powder on your feet before playing

3) Buy better shoes
3) Buy shoes with closer to your size.

If a shoe is too big, your feet moves around more causing friction.

Hope this helps.

 

gripping too hard would be the primary cause. put a band aid on it to prevent friction when playing and take it off when you're not playing.

 

FAIL!

1) Gripping too hard
2) Incorrect technique
3) Moist hands
4) Actual grip size is too small

 

I got a blister on my thumb once because the grip I was using was so worn out it rubbed my finger almost like sand paper

 

callus on index finger is normal. i have one on there and on the side of my thumb as well

 

where is this big blister, is it confidential?

 

It's not confidential, its on his index finger.

 

while u wait to heal, think through your gripping and stroke. If u can't change it, maybe change the overgrip to those thick foamy type.