Certain beauty hacks that you can find online have proven to be a game-changer in a positive way. For example, sweeping mascara towards your nose rather than upwards to increase your eyes’ width, according Life Hack. There are beauty trends that you might not be aware of, but they can actually cause skin problems. According to The Healthy, some of these trends have led to certified dermatologists gasping in horror at the negative effects they are having on skin health.

TikTok hosts an online community for beauty that is growing. Previously, YouTube and Instagram dominated the site. Insider reports that users can discover beauty trends that should not be followed on TikTok.

It’s both a blessing and a curse

In August, Dr. Rayna Dyck, a dermatologist, stated that the gift is that there’s so much information available. This makes it easier for people to understand things using everyday language. However, anyone can create the content. So in addition to dermatologists, great aestheticians and skincare experts who provide accurate information, there are also people who share advice that isn’t helpful or even harmful. Because they are popular and beautiful, everyone will try it, even if the results are not good for them.

Don’t contour with sunscreen

One TikTok trend that is just plain ridiculous when it comes to skincare trends is sunscreen contouring (via Glam). This involves applying sunscreen only to certain areas of the face, so that those areas are tanned. It creates a suntan contour similar to what you would get with bronzer and sunless tanning. It is time-consuming, dangerous, and difficult to do.

You’ve likely heard of the importance of sunscreen. According to the Journal of the Dermatology Nurses Association, one should do everything possible to protect their skin from sun damage. You can also get wrinkles and premature aging signs by not applying sunscreen to your skin every day. This is not the ultimate goal.

Glam was told by Dr. Debra Jaliman (a dermatologist board-certified with Paula’s Choice). “I would not recommend contouring sunblock.” Skin cancer is on the rise. Because ultraviolet light penetrates through clouds, it is important to use sunscreen every day. Protect your entire body and face with a single layer of sunscreen.

• Bottom line: Don’t forget to use sunscreen.

Topically, Aspirin should be avoided

According to Grazia, another skincare trend was created on TikTok: the use of aspirin to treat acne. The process involves taking several tablets of aspirin and crushing them down. After that, you use water to make a paste, before applying it topically on the skin. The paste should be exfoliating and relieve acne.

First, acne should be treated only by a dermatologist. Trying to treat acne yourself can lead to more skin damage. According to Dr. Shilpi Khatarpal, manipulating a pimple can cause more inflammation and increase scarring risk. “And your hands are filthy, so you can introduce more bacteria and possibly make it worse.”

FDA-approved acne treatments include topical gels and over-the-counter medications. A homemade aspirin paste for treating acne has never been approved by anyone. It can cause irritation and dryness. In response to the ineffective trend shown in a YouTube clip, Dr. Ahmed El Muntasar (U.K.-based NHS Frontline Doctor and Celebrity Aesthetician) actually said “I’m scared guys. You should be scared of this beauty trend if you are a doctor.”

Don’t microneedle your makeup on

Microneedling makeup is another troubling TikTok trend. According to WebMd, the cosmetic procedure involves pricking the skin using tiny sterilized needles. This is done to stimulate collagen production. Microneedling is also being tried by people in an attempt to stimulate eyebrow hair growth. However, dermatologists warn that this technique rarely produces promising results.

According to HuffPost, however, TikTok shows that some people are using microneedling in combination with makeup in order to create a semi-permanent or longer-lasting effect. DIY tattoos are dangerous because they can cause severe inflammation and permanent scarring.

HuffPost’s Dr. Karan Lal, of the Society for Pediatric Dermatology said that microneedling can penetrate deep into the skin. We have proprietary serums, platelet-rich plasma, and sterile solutions in our office that we use for microneedling. These are intended for post microneedling procedures. But, stamping makeup into the dermis with non-sterile ingredients is not only introducing microorganisms but also foreign particles such as zinc. This is why you shouldn’t do it at home, children.