Blister plasters turning white indicates that they have absorbed excess fluid which aids healing. You do not need to burst the blister to use Compeed^®.

What's the white stuff in a blister plaster?

Hydrocolloid blister plasters are exudate-absorbent hydrophilic gel dressings. They're rubbery and slightly translucent. As your deroofed blister weeps, the hydrocolloid material absorbs the fluid and turns into a gel. From the outside, it looks like a white bubble.

How often should you change blister plasters?

In these situations, it's better to use island dressings, changing them frequently (2-4 times per day), until the blister starts to weep less. At this point, you can speed healing up and benefit from the way hydrocolloids work.