@lenadunham / Instagram 1 / 9
@lenadunham / Instagram 1 / 9

Lena Dunham is back to baring it all again -- and she doesn't care what you think about her skin imperfections.

The "Girls" actress took to Instagram on Wednesday to take a bikini selfie and, in the process, proudly show off her endometriosis scars.

"When the Target swimsuit does a b---- right, Endo scars & all," she posted, clearing loving the way the mismatched two-piece looked on her.

Lena has been open in the past about her struggle with endometriosis, which she spoke about in her Lenny newsletter last November, calling herself "the sickest girl." Endometriosis is a chronic condition that affects women's reproductive health.

"Endometriosis is not life-threatening. It doesn't manifest externally very often; the symptoms just look like a pair of sweatpants and a Charlize Theron-in-Monster-level grimace," she wrote. "I know I'm lucky in the grand health scheme, but I also know that I am one of many women who grasp for a sense of consistent well-being, fight against the betrayals of their bodies, and who are often met with skepticism by doctors trained to view painful periods as the lot of women who should learn to grin and bear it.

She continued, "I am lucky to be insured. I am lucky to have found [her doctor.] I am lucky to be surrounded by love and to be able to control many aspects of my work schedule."

After suffering a health setback in February due to her condition, she was forced to cancel all her press engagements to promote her HBO show.

"As many of you know I have endometriosis, a chronic condition that affects approximately 1 in 10 women's reproductive health," she wrote at the time. "I am currently going through a rough patch with the illness and my body (along with my amazing doctors) let me know in no uncertain terms, that it's time to rest."

In March, she underwent surgery for a ruptured ovarian cyst. The following month, she maintained her sense of humor while being honored at the Blossom Ball for the Endometriosis Foundation of America.

"I'd like to start by thanking my uterine tissue for growing in places where it shouldn't. I'd like to give a shout-out to my fallopian tubes," she said. "I'd like to thank my ovaries … even though you've acted pretty b----- and weird the past few years."