Try the Res-Q Ointment from the brand Burts' Bees that most big Manling's have counters (e.g. IFC). I used it for 2 days and most 濕疹 were gone. It comes in a small green coloured round tin. Forget how much.
From the Feb's mom chatroom, someone also recommended a tea tree cream that Jusco and Teachers' Asso. sells. Haven't got the chance to try it myself though.