Sudden funky smell in my underarms

Name: 
Priyanka Parekh
More information: 
Hi! So for a couple of days now I have noticed a funky earthy smell coming from my armpits that I have NEVER noticed before. It's been cold and not sweaty at all. I have been using Tom's natural deodorant and I have no idea where this is coming from. I don't think its infection because I have no visible rashes.