Regarding the price of skin Botox, how do you provide an estimate for the butterfly zone rather than the entire face?

I am looking into the price of skin Botox because of enlarged pores on my nose and butterfly zone, as well as my skin texture. If I consult only about the areas I am concerned about rather than my entire face, I am curious how you explain the coverage area and the amount used in terms of units. I would like to know if you only consider area or if there are other criteria.

Could you please clarify whether the dosage mentioned during the Skin Botox consultation is based on units or includes the diluted volume? Even if the numbers look the same, I think it will be difficult to compare them without knowing what they mean. I would also like to ask if I can receive a quote that includes both the product type and the actual application areas. Before deciding on the areas for Skin Botox, I would like to verify the scope that best suits my pore concerns first, rather than making a decision based solely on the promotional price for the entire face. Please let me know if there are items that remain necessary even if the treatment area is reduced, as well as items that can be selectively excluded.