hello! i'll let know 1st that i've less or no idea about doing make-up. i use a sunscreen that my derma had prescribed.its MELAGARD 50+. It's got ZINC OXIDE alone with few other chemical blocks in it. as zno does,it leaves a slightly pale look. covered look. i have a concealer from AVON. AVON STICK CONCEALER. now,what i want to know is CAN I USE THE SUNSCREEN ALL OVER MY FACE AND THEN PUT THE CONCEALERS JUST ON MY POST-ACNE SPOTS/BLEMISHES ETC?? DO I NEED A POWDER/COMPACT/