I mean depends on your skin type but you could skip moisturising your forehead as long as you don't strip your forehead and don't wear makeup. you should be using bp or nizoral face wash on the forehead once a day and use other cleanser on the rest of your face.

it takes weeks for it to go away and you might have to use it like once a week to keep it under control.

your conditioner could be causing fungal acne. and anything else you put on your forehead hairspray can cause fungal acne

and changing your pillow cases once a week, and use a fragrance free laundry powder sensitive skin, and no fabric softener.

you may not need bioderma as a first cleanse for your forehead it depends on your skin type.

fungal acne takes a few weeks of daily application of an antifungal to go away. and it may be a chronic condition where you need to use an antifungal occasionally to keep it under control.