Obtain prompt medical attention. Remove any clothing that may restrict circulation to frozen area. Do not rub frozen parts as tissue damage may result. Never use dry heat. Call a physician as soon as possible.
Frozen tissue is painless and appears waxy with a possible yellow color.
It will become swollen, painful, and prone to infection when thawed. If the frozen part of the body has been thawed, cover the area with dry sterile dressing with a large bulky protective covering, pending medical care. In case of massive exposure, remove clothing while showering with warm water. Call a physician. Nitrogen is nonflammable and does not support combustion.