
Cock’s peculiar tumour is one of the complications of the sebaceous cyst. When the sebaceous cyst of the scalp ulcerates, excessive granulation tissue forms resembling fungating epithelioma, this is called Cock’s peculiar tumour. This tumour looks angry and sore. It is an eponym, named after the English surgeon Edward Cock . This tumour resembles that of squamous cell carcinoma. Treatment for this tumour is excision of the cyst as like sebaceous cyst after controlling the infection.