Definition of Vesicles:

A vesicle is a small fluid-filled blister.

See also: Bulla

Considerations:

A vesicle is small -- it may be as tiny as the top of a pin or up to 5 or 10 millimeters wide.

In many cases, vesicles break easily and release their fluid onto the skin. When this fluid dries, yellow crusts may remain on the skin surface.

Common Causes:

Many diseases and conditions can cause vesicles. Some common examples include:

• Allergic reactions to drugs
• Atopic dermatitis (eczema)
• Blistering skin diseases including porphyria cutanea tarda and dermatitis herpetiformis
• Chicken pox
• Contact dermatitis (may be caused by poison ivy)
• Herpes simplex (cold sores, genital herpes)
• Herpes zoster (shingles)
• Impetigo