1 alpha,24-dihydroxyvitamin D3 [ 1 alpha,24-dihydroxycholecalciferol,1 alpha,24-dihydroxyvitamin D3, (1alpha,3beta,5Z,7E,24R)-isomer,1 alpha,24-dihydroxyvitamin D3, (1alpha,3beta,5Z,7E,24S)-isomer,1,24-dihydroxycholecalciferol,1,24-dihydroxyvitamin D3,Curatoderm,PRI-2191,Tacalcitol ] RN refers to (1alpha,3beta,5Z,7E)-isomer; formulated in ointment at a concentration of 4 microg/g, for treatment of mild psoriasis