What is your skin care regime like? You might not be using the correct products to completely remove all the make up from your skin which can be making your blackhead problem worse. Have you gone to see a skin analyst before to maybe establish any vulnerabilities your skin might have to beauty products? These are just a few things to consider which might make the end results of using any foundation easier. I wear a lot of make up as part of my job and at night I start by wiping it off with a make-up remover wipe and then proceed to use a gel cleanser to deep cleanse, followed by the rest of my regime. This was recommened to me by my therapist so chat to someone about making the use of make-up easier.