Most studied cases of<unk>  occur in children and teenagers. There is a range of causes, but an understanding of the different motives and actions of fire setters can provide a platform for prevention. Common causes of<unk>  can be broken down into two main groups: individual and environmental. This includes the complex understanding of factors such as individual temperament, parental psychopathology, and possible neurochemical predispositions. Many studies have shown that patients with<unk>  were in households without a father figure present. Environmental Environmental factors that may lead to<unk>  include an event that the patient has experienced in the environment they live in. Environmental factors include neglect from parents and physical or emotional abuse in earlier life. Other causes include early experiences of watching adults or teenagers using fire inappropriately and lighting fires as a stress reliever.
Pyromania
Koilonychia
Schooliosis
Onychoschizia
Soteria 
Eryptosis
Onychauxis
Trachonychia