Hello Vijay, looking at the photo at present it doesn't look like cancer. But no one can say for sure clinically. If you want a confirmation of the diagnosis then dermoscopic examination or nail biopsy is advised. Ridge can come due to trauma to the nail it will gradually go away. You can consult with a dermatologist for the same. Hope this helps you.  Best regards, Dr Pinanky Jadhav Eternis clinic, Pune www.eternisclinic.com