3 weeks after initial<unk>  Tissue loss and autoamputation are potential consequences of<unk> . Permanent nerve damage including loss of feeling can occur. It can take several weeks to know what parts of the tissue will survive. Time of exposure to cold is more predictive of lasting injury than temperature the individual was exposed to. The classification system of grades, based on the tissue response to initial rewarming and other factors is designed to predict degree of longterm recovery. Grades Grade 1: if there is no initial lesion on the area, no amputation or lasting effects are expected Grade 2: if there is a lesion on the distal body part, tissue and fingernails can be destroyed Grade 3: if there is a lesion on the intermediate or near body part, auto-amputation and loss of function can occur Grade 4: if there is a lesion very near the body (such as the carpals of the hand), the limb can be lost. Sepsis and/or other systemic problems are expected. A number of long term sequelae can occur after<unk> . These include transient or permanent changes in sensation, paresthesia, increased sweating, cancers, and bone destruction/arthritis in the area affected.
Frostbite
Chilblains
Crossbite
Trench foot
Overbite
Snakebite
Abrasion 
Nasal fracture