Bump on the forehead?

So, I have this bump close to the top of my fore head. It is about 2 cm wide and 1 cm long. U can not see it but I can feel it. I asked my frend to feel it and she could not feel anything. Btw I was sick lke a day ago and it was a fever with headaches but i think it was just pms. Tht usually happens. And so should i be worried??? Plz help me and I am a 12 year old girl