Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.
Definition of Water blister
Medically reviewed by Min Clinic Staff | Updated: January 2026
Water blister: A blister with clear watery contents that is not purulent (does not contain pus) and is not sanguineous (does not contain blood).
A blister is medically termed a vesicle. One that is more than 5 mm in diameter with thin walls and is full of watery fluid is called a bulla.
The word "blister" entered English in the 14th century. It came from the Middle Dutch "bluyster", blister and was a modification of the Old French "blostre" which meant a leprous nodule -- a rise in the skin due to leprosy.