The cause of<unk> s is still unknown, but it is believed that exposure to radiation can trigger the condition. This is evidenced by a higher rate of cases occurring on the face and hands, areas that are often exposed to sunlight. Other cases have reported<unk> s arising from burn scars. As with many other wart-like skin conditions, a link to the HPV virus family, especially the HPV-2 subtype has been suggested.
Cutaneous horn
DermAtlas
Dermatome 
Dermatome
Dermal patch
Pinard horn
Neuromatrix
Ecamsule