Can i use clobetasol ointment or cream for eczema? (dyshidrotic eczema) until when? thanks.

Yes you can: Keep in mind it is a "strong" steroid prescription medication so use it sparingly and do not use it for weeks upon end. A good plan would be to use it for 2 weeks, then off 2 weeks. It can discolor or thin the skin out or cause striae if used too much. Also avoid using it in certain areas like the face or the inguinal area where the skin is very thin.