The clenziderm m.d. Systems are the only prescription-strength acne treatment that contain a patented form of 5% benzoyl peroxide (bop) to penetrate deep into the skin and treat acne where it starts. The clenziderm m.d. Systems demonstrate greater penetration than other bop-based treatments.. Step 1, daily care foaming cleanser. Step 2, pore therapy. Step 3, therapeutic lotion.