The former TOWIE star-turned-fitness guru, 24, suffered a nasty looking cut on Thursday (12 May), which she showed off to fans via a rather graphic Twitter post.
Alongside a photo of her bloodied knee (which you can see at the bottom of the article if you can face it!), she said: "Today wasn't my favourite. Only mid & maxi dresses for a while."
Lots of fans messaged her back to say they hoped she was okay.
@lucy_meck really hope you are ok Lucy xx— Lou lou (@Oreokicks) May 13, 2016
@lucy_meck oh you poor thing feel better soon xxx— MichaelAnthonyBarron (@Mikey_Beau) May 12, 2016
@lucy_meck Oh my god, that looks so painful— Molly Barnes (@MxllyBarnes) May 12, 2016
@lucy_meck what on earth did you do? Hope your ok!— Justin Pryke (@djjustintime11) May 12, 2016
Earlier in the day, Lucy had told fans she was working out – "summer body is in process" – no doubt filming new videos for her Results With Lucy website.
Speaking to The Mirror Money recently, she admitted she never expected the fitness and nutrition website to be so successful. "It's been a surprise to me because we didn't set it up with a view to making a huge amount of money. Me and my personal trainer Cecilia came up with the idea one day because I didn't really like the gym - I thought it was really intimidating and I still feel that way.
"We had a little brainstorm about how we could change that, and make training more affordable for someone at home who doesn't have the time or the childcare to go to the gym, and that's how we came up with Results with Lucy.
We started with 30 workout videos. Now we've got over 450, which vary in length from five minutes to 45 minutes. There is such a wide variety of videos on there now, which suit everyone from beginner to more intermediate, and you can mix and match them."
Today wasn't my favourite— Lucy Mecklenburgh (@lucy_meck) May 12, 2016
Only midi & maxi dresses for a while pic.twitter.com/o1VVhtxwog