vesicle

This term carries a clinical, sterile tone and is primarily used in medical, biological, or dermatological contexts. It describes a specific physical architecture—a spherical container designed to isolate or transport substances. In a cellular context, it suggests a dynamic process of movement and secretion. When used in dermatology, it specifically identifies a type of lesion. It is more precise than the word blister, which is a general term for any skin bubble, whereas a vesicle is strictly small and clear. It evokes an image of a tiny, translucent drop of fluid trapped beneath a thin layer of tissue.