603999 Disclosed is the use of 2-amino-2-[4-(3-benzyloxyphenylthio)-2-chlorophenyl]ethyl-propane-1,3-diol or the corresponding phosphate derivatives phosphoric acid mono-{ (S)-2-amino-4-[4-(3-benzyloxy-phenylsulfanyl)-2-chloro-phenyl]-2-hydroxymethyl-butyl} ester or phosphoric acid mono-{ (R)-2-amino-4-[4-(3-benzyloxy-phenylsulfanyl)-2-chloro-phenyl]-2-hydroxymethyl-butyl} ester, in the manufacture of a medicament for the treatment of scLE (Subacute Cutaneous Lupus Erythematosus).