As per Pathoma,

"Vascular permeability occurs at the post-capillary venule"

This is why, when you have edema, you would have gaps in the venules.

In situation of an inflammatory response such as in burns, anaphylaxis or sepsis, intercellular contacts disintegrate in post-capillary venules leading to intercellular gap formation.

https://www.ncbi.nlm.nih.gov/pubmed/28231640

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Which type of cell we r going to find in blisters?, neutrophils?