From OMIM
Congenital indifference to pain is a rare autosomal recessive disorder characterized by the complete absence of pain perception typically associated with noxious stimuli. Affected individuals are aware of a stimulus, but have lost the ability to perceive pain. Most patients are hyposmic or anosmic. Other sensory modalities are unaffected, and there is an absence of overt autonomic symptoms. Sural nerve biopsy and nerve conduction velocity studies are normal (summary by Cox et al., 2006; and Goldberg et al., 2012). Hereditary sensory and autonomic neuropathy type IID (HSAN2D) is an autosomal recessive disorder characterized by congenital or childhood-onset distal loss of pain and temperature sensation as well as autonomic dysfunction accompanied by hyposmia, hearing loss, hypogeusia, and sometimes bone dysplasia. The phenotype is highly variable, even within families. Two Japanese families have been reported (summary by Yuan et al., 2013). For a discussion of genetic heterogeneity of HSAN, see HSAN1 (162400).  http://www.omim.org/entry/243000

From MedlinePlus Genetics
Channelopathy-associated congenital insensitivity to pain is a condition that inhibits the ability to perceive physical pain. From birth, affected individuals never feel pain in any part of their body when injured. People with this condition can feel the difference between sharp and dull and hot and cold, but they cannot sense, for example, that a hot beverage is burning their tongue. Pain is a vital signal that helps people avoid danger and injuries. People who cannot feel pain experience more  injuries and may have shorter life expectancies.

The first signs of channelopathy-associated congenital insensitivity to pain often occur when an infant shows no response to stimuli such as an injury or medical procedures like vaccines. Young children with this condition may have wounds from biting or burning themselves.

A lack of pain awareness often leads individuals to develop wounds, bruises, broken bones, and other health issues that may go undetected. Long lasting joint injuries (often occurring alongside broken bones) can lead to joint deformities and often the loss of normal use of that body part. Eye injuries that go unnoticed can lead to vision loss. Many people with channelopathy-associated congenital insensitivity to pain also have a complete loss of the sense of smell (anosmia).

Channelopathy-associated congenital insensitivity to pain is considered a form of peripheral neuropathy because it affects the peripheral nervous system, which connects the brain and spinal cord to muscles and to cells that detect sensations such as touch, smell, and pain.  https://medlineplus.gov/genetics/condition/channelopathy-associated-congenital-insensitivity-to-pain