Cyanosis is the sign of underlying disease. Risk factors related to the presence of underlying conditions should be noticed. 
Common risk factors in the development of  congenital heart diseases with the right to left shunt include maternal age >35 years, No intake of the multivitamin, febrile illness in the first trimester, obesity, paternal age> 25 years.
Cyanosis risk factors
Cyanosis causes
Encephalopathy risk factors
Acute retinal necrosis risk factors
Uveitis risk factors
Hyperkalemia risk factors
Subarachnoid hemorrhage risk factors
Erythrasma risk factors