I agree with the other comments . You can also make a diffuser by getting two pieces of thick glass and polish or tape the edges (no cut fingers) and place a small amount of baby oil between them adjust as needed. I have used this technique for some portraits and nudes where the model had a peeling sunburn and it was very effective. It keeps a generally focused look but softens some details probably by creating flare. you hold the glass under the enlarging lens and move it while in the focus mode until it looks right then repeat when projecting the image on to the paper.

http://www.jeffreyglasser.com/