Bioequivalence of Ethylenediamine Dihydrochloride Study

Inclusion Criteria: * Current or previous symptoms and/or history consistent with allergic contact dermatitis, and positive patch test (within the past 10 years) to ethylenediamine dihydrochloride * 18 years of age or older, otherwise in good health * Female subjects of childbearing potential must consent to a urine pregnancy test; results must be negative for study inclusion. * Informed consent signed and understood by each subject. Exclusion Criteria: * Subjects unable to meet inclusion requirements * Women who are breastfeeding or pregnant * Topical treatment during the last 7 days with corticosteroids or other immunosuppressive agents on or near the test area * Systemic treatment during the last 7 days with corticosteroids (equivalent to \> 10 mg prednisone) or other immunosuppressive agents * Treatment with ultraviolet (UV) light (including tanning) during the previous 3 weeks * Acute dermatitis outbreak or dermatitis on or near the test area on the back * Subjects unable to comply with patch test study requirements including multiple return visits and activity restrictions (e.g., protecting test panels from excess moisture due to showering or vigorous activity) * Subject participation in clinical trials of investigational drugs, treatments, or devices, other than T.R.U.E. TEST, during this study or 3 weeks prior to inclusion in this study