Someone asked what to do about a bubble in the wing of a butterfly. First, nothing! Nothing, that is, until the wings are totally dry.
The bubble is full of hemolymph/blood, the same fluid it used to pump its wings full. If a wing vein has a leak, a bubble of the fluid will form. Once the wings dry, the bubble can be popped with no damage. Even if wings aren’t dry, it usually doesn’t damage the wing but it is best to wait for the wings to totally dry.
Once popped, there will be little flakes of wing that break off, often leaving a hole in the wing. The hole will not damage the butterfly or its ability to fly.