<s>[INST] I have a cold sensation on the right back side of my head that started last night. This spot on my scalp feels cold, and bare like there is nothing there also very sensative and hurts when i touch it. What could this be? Could this be brain cancer or tumor? [/INST] HIWell come to HCMI really appreciate your concern, it is the nonspecific kind of feeling and it could be due to anxiety and depression and for sure it is not the cancer or tumor of brain try to come out of the stress and control your thoughts and stop worrying,  hope this information helps. </s>