<s>[INST] I have a lump on the back of my head where the hairline is. I thought it was an ingrown hair but I ve taken the scab off repeatedly and it keeps coming back. Has not gotten any smaller either. My family members looked at it and it s a little smaller than a dime. No hair follicle seen. Could it be cancer?? [/INST] neither it is cancer or any other thing to worry much!it is possibly a sebaceous cyst and get an FNAC test to solve your concern!all the best! </s>