<prompt> Cocks peculiar tumor is -Rodent ulcer of noseLocal osteomyelitis of craniumChronic infection of sebaceous cystKeratin horn  <response>: Ans. is c i.e., Chronic infection of sebaceous cyst o Cocks peculiar tumour is actually a complication of sebaceous cyst. When the sebaceous cyst of the scalp ulcerates excessive granulation tissue forms resembling fungating epithelioma.This is called cocks peculiar tumour. 