Question more or less a sore?

I work in an bureau and all i do is sit adjectives day. i lately noticed a sore on my stomache and im not that skinny so i be wondering is this sore from sitting all morning?? or what could it be. You need attain up and walk around every hour or during your break. You shouldn't sit as most time. Because, you're not enough excerise. Let me inform you, I was taking a flight to Los Angeles from Thailand. It's gross me sore with my stomach during long flight. I way of walking around entire aircraft evey two hours. It does help me near my stomach. I took over 17 hours flight times in between Thailand and Los Angeles. I'm home surrounded by Thailand now.
is it similar to a pimple on your body?