Always popular, body parts receive extra scrutiny from two provocative new plays this weekend. Opening Thurs., FEB. 1, at 7 Stages, MY LEFT BREAST by Susan Miller, a consulting producer on "The L Word," depicts a woman undergoing profound life changes as a wife and parent after being diagnosed with breast cancer. Meanwhile, the Top Shelf Space at Dad's Garage Theatre focuses on the epidermis with the Fri., FEB. 2, world premiere of Steve Yockey's SKIN (pictured), in which desire and identity crises complicate two couples' bedroom activities. My Left Breast: Through Feb. 25. $20-$25. Thurs.-Sat., 8 p.m.; Sun., 5 p.m. 1105 Euclid Ave. 404-523-7647. www.7stages.org. Skin: Through Feb. 24. $10-$15. Fri.-Sat., 8 p.m. 280 Elizabeth St. 404-523-3141. www.dadsgarage.com.