Hi,
I have a bump on the back of my head at the bottom, it does not hurt at all when I touch it, at the beginning it was at one side now it is at both sides.
I went o the doctor and she told me it is a bag of fat and will be removed when it grows.
My questions is it logical to have 2 sac of fat in my head ?

I am picturing this and I think I can explain, so bear with me. You don't say how old you are and how much you weigh. Are these 'bags of fat' just rolls on the back of your neck, one below the other ?