Most probably the lesions over your face are that of seborrheic dermatitis
only. The similar involvement of your scalp also supports the diagnosis. Though you can use a plain coal tar
based shampoo, it would be more beneficial if you use a ketoconazole
and coal tar based shampoo( for eg konaz ct). For your face lesions use a steroid
anti fungal combination (like momoz t) twice in a day for a week. Hope that solves your query. Take care.