What can cause me to get blisters on my tongue?

Blisters: Blisters can form from acidic or spicy foods. This is the most typical cause and type of blister. They typically resolve in a few days. Although, if resolution isn't reported in a few days or worsens, see a dentist.

Burn/salivary gland: I'd imagine a burn could cause something like this. But, i think that a blocked salivary gland is more than likely the cause. It's hard to diagnose anything without more info. I'd get it checked out.