Liquid-filled bumps underneath the skin are known as blisters and may be caused by diseases such as dyshidrosis, herpes simplex, impetigo or chicken pox. With time, the liquid inside the blister drains back inside the body, and the skin becomes painful to the touch.

Dyshidrosis

Dyshidrotic eczema, also known as dyshidrosis, is a common disease in which blisters occur. The liquid-filled bumps appear on the palms, fingers and feet. Treatment of dyshidrosis is similar to allergy treatments.

Onset of Dyshidrosis

A blister develops when there is continuous friction between any surface and skin. An example of this is walking in tight shoes with no socks. When the friction is continuous, the rubbing can tear apart two layers of skin, letting a clear fluid enter the gap between the layers.

Herpes and Chickenpox

Blisters can also occur in herpes and chickenpox. In herpes, there is a great deal of pain and swelling on the skin before the blisters develop, and there is no cure for the disease. Chickenpox blisters, like herpes, are very contagious but usually dry up in a few days.

Other Causes of Blisters

Blisters may also develop from impetigo and are often big and pus-filled. Although the blisters can get large, they are generally painless. Impetigo blisters take longer to scab over. Reactions to allergens such as metals and some foods may cause blisters, too.

Prevention

Using talcum powder on sensitive areas of the skin and wearing socks may help prevent blisters caused by dyshidrosis.

Source:

ClearSkinExpert.com: Bumps of Clear Liquid Underneath Your Skin