Efek Centella Asiatica terhadap Kulit Kering pada Penyandang Diabetes Melitus Tipe 2: Kajian terhadap Kadar N (6)-Carboxymethyl-lysine, Interleukin 1-α, dan Aktivitas Superoksida Dismutase pada Stratum Korneum = The Effect of Centella asiatica in Type 2 Diabetics Dry Skin : A Study of N (6)-Carboxymethyl-Lysine Concentration, Interleukin 1-α, and Activity of Superoxide Dismutase in Stratum Corneum