Lemon or lime juice
Citrus juices are said to help lighten dark spots... but it could also cause second degree burns. Yes, the juice contains vitamin C and alpha hydroxy acids, which might seem like a good thing, but remember that these ingredients are used in much lower (and thus, safer) concentrations in your skin care products.
NYC-based dermatologist Dr. Michelle Green explained to Greatist that DIY citrus juice treatments "can cause severe irritation, especially for those patients that have sensitive skin." So, steer clear — you're better off with a good vitamin C serum or AHA toner!
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Cinnamon
Remember a few years ago there was a cinna-mask challenge and everyone was saying how amazing it was... until people started reporting that it burned their faces? Yeah, it's not something you should apply to your face.
Facialist and skin care expert Andy Millward told Metro UK that while, yes, there are potential skin care benefits to cinnamon, applying it directly to your face could cause irritation, such as contact dermatitis.
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Apple cider vinegar
It's been touted to help everything from skin blemishes to sunburns, but Medical News Today says there is little evidence to support these theories. And though some claim that using diluted ACV could help restore the skin's proper pH balance, this hasn't yet been proven.
Even diluted solutions of apple cider vinegar could cause chemical burns, so be very careful. And if you have a pre-existing skin condition, be sure to speak to your doctor before trying any DIY ACV treatments.
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Essential oils
While some essential oils have benefits such as antioxidants or natural antibacterial properties, they can often do more harm than help, according to Paula's Choice.
Be warned: Essential oils such as rosemary, lemongrass, thyme, cinnamon, citronella and tea tree oils have been said to be helpful for skin, but they can also cause major irritation and redness. You should especially avoid fragrant oils.
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Sugar
Joshua Ross, celebrity aesthetician and founder of West Hollywood's SkinLab, told Byrdie that he doesn't recommend sugar scrubs, as they can cause irritation and microtears. He says you're much better off with a washcloth and a mild chemical exfoliator.
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