The 29-year-old "Girls" creator took to Instagram to clear the confusion.
"Hey Tentaciones- thank you for sending the uncropped image (note to the confused: not unretouched, uncropped!) and for being so good natured about my request for accuracy. I understand that a whole bunch of people approved this photo before it got to you- and why wouldn't they? I look great (sic)," Dunham wrote.
"But it's a weird feeling to see a photo and not know if it's your own body anymore (and I'm pretty sure that will never be my thigh width but I honestly can't tell what's been slimmed and what hasn't.) I'm not blaming anyone (y'know, except society at large.)," the actress wrote, adding that she has a complicated history with retouching.
"But this is not what my body has ever looked like or will ever look like - mad photoshop has been done to this iteration. So if you're into what I do, why not be honest with your readers? Much love, Lena," Dunham had earlier written.