Why do I have a really noticeable bag under one eye?

[Baggyeye]

Can anybody help explain why I have a much more noticeable under eye bag on one side of my face? And what on earth can I do to sort it out?

Recently had a Guinot facial that has helped de-puff the under eye area but the skin there looks like its loosing its elasticity and is a bit saggy towards my cheek.

I'm mid 40's. Best suggestions to counteract eye bags please. It's my first noticeable sign of ageing which is not a good feeling. It's also annoying that it's worse on one side of my face than the other!

Do you sleep mostly on that side? It can be sinus issues if you have a preferred sleeping side.

One side of my face is definitely more deeply lined than the other - I think it's because I mostly sleep on that side.

I do sleep on that side mostly. I will have to try and vary how I sleep (though can't sleep on my back as my husband says I snore then!)

I was also going to say sinus. I suffer with mine quite a bit and when one is playing up I get a dark bag under that eye. I have quite big bags anyway (thanks dad...)

Interesting I always thought sinus problems were internal congestion. Anything that can be done about them other than not sleeping on that side?