Collins Advanced Dermatology Institute Share: Medical Providers/ Healthcare Services Collins Advanced Dermatology Institute Visit Website 311 S. Hwy 183 Leander, TX 78641 (512) 379-6090 (855) 999-3376 (512) 379-6098 (fax) Hours: Monday - Thursday 8am-5pm Friday 8am-12pm Closed from 12pm-1pm for lunch About Map About Medical, Cosmetic, Surgical Dermatology for all ages. We accept all major insurance plans. Directions Head North on old 183. We are located 1 mile North of Crystal Falls on the left hand side. (Just below the giant billboard)