hello and welcome to hcm,
brother do not assume or presume by yourself.
flesh clor spot may be due to biting cusps of tooth also.
if you have any chewing habit then also, cancer do not start very fast and if you have any such habit then stop it immediately.
if the condition you think by yourself as cancer then you might not be able to eat properly from that side or it would have been difficult for you to rotate the neck smoothly also.
and what you have mentioned do not give such assumptions, so take a deep breath and visit the dentist
and for your personal safety ask him/her for the biopsy