It would be better on your part to have a consultation with skin specialist. He may prescribe blood test at the initial stage to ascertain the severity of the disease. Maybe he would like to have a X- Ray report so that he can understand the progression of the disease. After evaluating your blood report and X- Ray, he would prescribe you antibiotics with a suitable potency and also duration of administration of such antibiotics is to be decided by him.
Hence instead of self medication, you must follow the advice suggested by the specialist. In that way, there will be curtailment of time in respect of treatment and also the progression of disease as a result of wrong treatment can be arrested.
There are a lot of products like Zalim - lotion in the market and by seeing such advertisements innocent patients are entrapped loosing both money and inviting unnecessary health issues. You must take a prudent approach.