<unk>  has an unknown cause but researchers presume it to be similar to the causes of squamous cell carcinoma. Carcinoma is found in almost 40% of<unk> . It is mostly found in elderly men around the ages of 65 - 74. It is commonly associated with smoking. Alcohol and tobacco use have been described as risk factors.
Erythroplakia
Malakoplakia
Microspherophakia
Leukoplakia
Epikeratophakia
Telogen effluvium
Hairy leukoplakia
Aphakia