My eczema on my feet does this, as does the eczema on my husband's hands. My ped has said that rashes, fevers and the like are not normal for teething and to be very careful about blaming these on teething.
Our eczema has different and varied triggers. Some of the "easy" ones are: scented/dyed products, synthetic fibers (in clothing, diapers, sheets), too much soap remaining in clothing when washing, ditto on too much soap after bathing, hormones in dairy/meat.
Eczema is an auto-immune issue, so anything like a cold, flu or other issue that your immune system is also dealing with will generally flare it.
Meaghan (29) Torq's wife (34); Niall's SAHM (9/09); Rivka's birthmom (6/03)