Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain it seems that you are suffering from Seborrheic dermatitis commonly referred to as Dandruff.
It can occur due to causes like
Fungal infection, change in climatic conditions, poor immunity, genetics etc..
The medication that is steroid lotion
Betamethasone and Zinc sulphate lotion advised to you is appropriate and you should continue with the same but do not continue steroid for a long time without consulting your treating physician as it can have side effects on long term use..
You should also wash your scalp with shampoo containing
Ketoconazole, Coal tar, sulfide, zinc, selenium etc..
You should keep the scalp clean..
You can also be advised
Pimecrolimus lotion and PUVA
light therapy for relief..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.