could be one possiblity but then you dont say there is itching
is there any scaling with winter exacerbation-- in that case psoriasis
has to be ruled out.
is the border elevated- we have to rule out various causes or annular erythemas
best to wait for a few more days to see how it progresses
oh - incase your profession involves standing for quite some time we might even have to consider eczematous conditions related to stasis
in then mean time please apply white petrolatum jelly liberally
a pic will help