I think the history and the description in your brief question in more in favour of Seborrheic Dermatitis
which is a common,harmless and recurring skin condition. The exact cause is not yet found but it is said that in SD there is an increased sensitivity to yeast called Malassezia
and can be aggaravated by stress
Now the medications prescribed are i think ok,if they dont work then you can apply CLOTRIM HC cream which is combination of a mild Steroid
and an anti fungal. You should also have some anti allergics like Tablet Zyrtec 10mg once at night for a week.
The name of the cream from germany is i think an anti biotic called Fusidic acid
and i think there is no role of it in SD untill and unless its infected.
I hope the information will help.
thanks and all the best.