Vet visit is in order. You can try messing around with it, while it just gets worse, or take your cat in before it worse and more $$$$.
In addition to the things mentioned above, it could be an allergy, though that is low on my list based on the locations.
Skin kids - Jason, Kevin, Allison
Canine kids - Bennett & Bailey (always in our hearts), Riley, Banker, Rogue and Boz
Feline kids - Zoey, Talley and Abra