Welcome to Texas Dermatology Associates. At Texas Dermatology Associates, our mission is to provide quality medical care to our patients. ... Dallas 3900 Junius St., Suite 145 Dallas, TX 75246 Phone: 972-386-7546 Fax: 972-661-3255. Mansfield 1830 E. Broad St., Suite 102 Mansfield, TX 76063 Phone: 682-518-1515. ... Patient Portal Login..