Plastic perfume bottle bloated/swelling?

I bought some Victorinox mens cologne which unfortunately came in a plastic bottle. It's a regular square shaped bottle but I can tell that it's slightly bloated or swelling, the front and rear especially look like they are pushing out a bit. 

I'm wondering if this would mean the stuff is going bad or if it's a normal, expected reaction. I know alcohol and plastic aren't a great mix but it's a nice smelling cologne and I wasn't planning on keeping it long. I don't know if I should open it to see if it will reduce the swell or maybe it's best to replace it with a newer bottle.