Adele is raking in millions during her Las Vegas residency ... but she's not just growing her wealth in Sin City, she's also developed a nasty fungal skin infection.
Chatting with her fans at her show over the weekend, Adele got super personal -- telling everyone she'd recently been diagnosed with a case of good ole fashioned jock itch.
The way Adele explains it -- she wears Spanx during her shows to make sure all of her costumes fit -- combine that with the hot lights, and it's a recipe for sweat soup. The singer says she noticed the condition developing ... and was officially diagnosed with jock itch by her doctor.
In a hilariously-candid moment, she talked about her treatment for the condition, saying, "So it looks like I am an athlete basically, so I have to squirt it on myself. I don't know why the f**k I just told you that!"
Adele's still got about 5 months left of shows in her residency, so she better hope she can get everything under control!