All though it is my favorite method of application a makeup sponge can hold bacteria, unless you are using a new one or freshly washed sponge daily. Unlikely, right? So if you are dealing with acne or just a break out ditch the sponge for your finger tips. Open acne will heal quicker and break outs will disappear faster. Then you can go back to your sponge, wash or change it weekly in any condition your skin is in.