Help! I cannot figure this one out...

I am so sick and tired of these allergic contact dermatitis (aka eczema) patches on my left foot. There have been ZERO on my right foot, so why is it on my left? I never do anything special with my left foot...  These days I'm either wearing 100% cotton socks with shoes or flats which don't touch the top of my foot.

allergic_contact_dermatitis_on_foot

Got any ideas of what's causing it?

Makes no sense to me...

I want it to go awaaaaaaaaaay.