A blister is an area of raised skin that appears to have a watery liquid inside.
Chafing is usually caused by any activity that requires skin to repeatedly rub against another area of skin or article of clothing. Moisture can worsen chafing. The most common symptom of chafing is a painful stinging or burning sensation.
Blisters are caused by friction (rubbing), pressure or a burn. Your body responds to the friction by producing lymph fluid. As your outer layer of skin separates from the inner layers the space between them fills with fluid and the fluid builds up beneath the part of the skin being rubbed, causing pressure and pain. A single blister is often caused by:
Other causes of blisters include contact with irritants (chemicals, plants or toxins); drug reactions, autoimmune diseases and infection. If you have multiple blisters or severe burning you should see your doctor immediately.