Do you think it's possible to change physical things about yourself by the power of will?

My mom's doctor told her that it was possible to "will" away these little spots on her hand.. that she could visualize them going away and they would.. eventually a mosquito bit her hand and they went away.. but I was thinking.. say, for example, I have a receding hairline, and I intensly visualized my hair growing back, would it possibly work? I know this sounds crazy but our brain can't tell the difference between what it sees and what it visualizes so it has the same effect.. maybe me visualizing my hair growing back would cause something in my body to make it grow. Ahaha, if you can't tell I'm desperate and seeking validation.. and hope.