Lena Dunham bared even more than usual yesterday when she posted a bikini picture on Snapchat that showed her endometriosis scars. She captioned it: "when the Target swimsuit does a bitch right, Endo scars & all."

Snapchat: Lena Dunham

The Girls actress recently opened up in her weekly newsletter Lenny Letter about her struggle with endometriosis, a disorder that causes the tissue lining the uterus to grow outside of it, causing chronic pain and other potential side effects like excessive bleeding, fatigue, bloating, and possible infertility.

Sources: People