The Love Island star, 24, has been plagued by illness while on holiday in Mauritius with boyfriend Wes Nelson.
Megan took to Instagram on Sunday to show that her chest has been left covered in hundreds of blisters.
She wrote: "So if you're wondering why my IN story has been dead the last few days, I've been suffering from a severe kidney infection.
"Now got antibiotics and it's made my skin so sensitive to the sun I have actual blisters. Swear I need to do a blog of my eventful/uneventful life."
She added: "Sad pout."
Megan and Wes jetted off on their sunny holiday last week and they have been pictured making the most of their beach break to top off an amazing year.
She has had a whirlwind few months as she has bagged a huge role as ambassador for PrettyLittleThing.
Megan has already made waves in a sensational little black dress as she celebrated at the brand's star-studded party with Ashley Graham last week in California.
The Love Island favourite was the most recent addition to growing host of ambassadors for PrettyLittleThing, including KUWTK star Malika Haqq, models Jasmine Saunders and Izabela Guedes, and YouTube star Kelsey Calemine.
Meanwhile Megan was forced to defend herself against social media trolls who criticised her.
She normally chooses not to engage with them, but there was a comment a few weeks ago that made her so angry she had to respond.
Speaking to the Sun's Fabulous magazine she said: “I am quite a sensitive person and I’m just human like everyone else.
“I might have a blue tick, but I still have feelings.”
The person in question had commented on a photo of Megan from a celebrity event and “kindly” informed her that she was “so fat now”.
Megan was momentarily crushed, but fury quickly took over and she decided to publicly call the troll out and encourage other women to embrace their curves.
“I really made an effort that night. I got a stylist, got my favourite hair and make-up artist, and I felt like a princess.
"I was in such good spirits and then to see all these negative comments, I was like: ‘What the hell?’. It’s so nasty to look at a picture and to take time out of your day to criticise and pull me apart."
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