If you're now thinking you'd be better off just DIY-ing your skincare products, that isn't always a surefire way. The best option? Leaving this matter up to professionals. According to the experts, here are some things you should never put on your face.

1. Body lotion is a no 

Using body lotion when you run out of your facial moisturiser is fine. But routinely lathering your face with lotion that's designed for your body is a big fat nope. 

Michael Kaminer, a board-certified dermatologist and cosmetic surgeon says, "[Doing this] too often can lead to blocked pores." Of course, no one wants to deal with blocked pores!

2. Avoid bar soap

As a kid, you may have used a handy dandy bar of soap. As an adult, however, that's not the best idea.

"Washing the face is a complex interaction," Zoe D. Draelos, a clinical associate professor of dermatology in Winston-Salem, North Carolina, explains. "Cleansing the skin is a fine balance between balancing the skin's hygiene and leaving substances that are integral for the functioning of the skin."

Bar soap just doesn't seem to be able to strike that delicate balance. This is because the soap utilises chemicals that are both tough on the skin and unnatural. The result is rough, dry, and itchy [skin]. 

3. Hairspray is not a substitute for setting spray

Setting spray, also called finishing spray or makeup setting spray, is a really useful tool in helping your makeup stay put all day. Well, couldn't you just use hairspray to achieve the same result?

David E. Bank at The Center for Dermatology in Westchester, New York recognises the affordable trend of using hairspray as setting spray but he doesn't endorse it. "Hairspray contains alcohols, which can strip the skin of moisture," he explains. "It can also clog your pores and lead to irritation and acne flare-ups."

4. Don't put lemons on your face

Does citrus belong in skincare? Some think so, but that is not the case. Lemons contain the chemical psoralen, New York Dermatologist Doris Day, explains, and you can't put lemons on your face without also transferring psoralen. This powerful chemical makes your skin very sensitive to light. According to Day, it takes as few as ten minutes to activate and as long as 24 hours to wear off. If you were to then go out in the sun, your skin could actually blister.

The same is apparently true with limes and lime juice, which are actually common DIY acne treatments, reported Reader's Digest. 

5. Hot water = horrible

How hot do you take your showers in winters? Chances are, probably too hot. The best shower temperature for your skin is around lukewarm, Sejal Shah, a New York City based dermatologist, explains. Most experts agree that water below a temperature of 110 degrees is best.

"Hot water strips the skin of its natural oils leading to dry, itchy skin and eventually eczema," Shah says. It can actually strip the moisture out of your outermost layer of skin." This is truly a sad news for hot water lovers.

6. Egg white masks? Pass

The internet abounds with egg white mask concoctions. There's so many that you could make the assumption that they're completely safe. "You have to be careful with the egg white mask because egg whites sometimes have salmonella," CNN reported. 

Although you cannot get salmonella from just putting egg whites on your skin, the chances of you ingesting egg whites becomes greater. Consequently, your chance of getting salmonella is increased.

7. "Secret" ingredients

"Never use products that do not list out their ingredients," Boca Raton Dermatologist Jeffrey Fromowitz explains to Reader's Digest, "You must know what you are putting on your skin." Otherwise, you won't know if you're allergic to any of the ingredients until trying it. Plus, even if you're not allergic, you could be lathering your face with an ingredient you shouldn't even be putting on your face. 

8. Wax on? More like wax off!

Raise your hand if you get your eyebrows waxed on a regular basis. You're not alone. Women have been using "pencils, waxes, powders, gels, and more" to get the iconic bold brow we all have come to know and love. There's just nothing quite like having perfect brows. That said, wax is not the recommended method to achieving them. 

Jennifer MacGregor, a dermatologist at Union Square Laser Dermatology, reveals, "The hot wax adheres to your skin and pulls off a layer along with the hair. If you use retinoids or exfoliants regularly it could even cause you to blister, burn, scab or scar. Ouch!" Yes, "ouch" sounds about right.

9. Products expire for a reason

Would you use expired makeup? It seems innocuous enough, but there's good reason to toss your old skincare products and cosmetics. 

Jeremy Brauer, Clinical Assistant Professor at the Ronald O. Perelman Department of Dermatology, explains that when products expire, the active ingredients within them become inactive, which means the product will no longer work the way it was intended. In turn, the product could also cause skin irritation. This is true even if your expired products look and seem fine. – Brittany Brolley for The List