recent increase in the size of the spot on the scalp which you mentioned is something to be worried about. is ther any pain , itching or redness over the spot and how are the borders of the spot is it - regular and well defined or irregular and illdefined? how was it progressing - gradual or sudden? some times a spot like melanotic spot may have serious consequences and your sufferring from chronic migrane
that is dull aching pain. so it is always advisable to consult a neurologist
and a dermatologist
for physical examination. you may require a CT scan
brain and a skin biopsy
from that spot over the scalp.