Should I go to the doctor for this?

xXxcourtxXx
i know this is going to sound really really stupid. but just hear me out. I was racing my 9yr old sister to an elevator yesterday. I was trying to stop her from pressing the button. because I wanted to push it(mainly just to p*ss her off ) anyways we both ran in there super quick and ended up falling. I hit my head on one of the walls of the elevator. it hurt for a little bit. but nothing to be overly worried about. I actually forgot it even happened.

but today a spot behind my ear on my head hurts when you touch it. the spot is like between the top of the pointiest part of my ear and the beginning of my ear lobe. I was trying to tell if it felt larger than the other side but its sort of hard to tell. but I do think I have a small bump. and I have had a headache all day.

i guess the headache could be the result of being tired or a little bit of stress or the combo of all three things. I Haven't had a chance to tell my mom yet. it didn't hurt yesterday when I saw her so I forgot. and I Haven't seen her since I left for school this morning and she isn't coming home till late. I will tell her in the morning. but should I be worried about this?
Should I go to the doctor for this?
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