Never Put These 11 Things on Your Face (They Age You Faster)

Berg stressed that the skin’s acid mantle is slightly acidic (4.5–5.5) while ACV straight falls between 2 and 3 — a logarithmic difference that makes it 100 to 1000 times more acidic. He related a personal story about killing his lawn with ACV spray within two days to emphasize how caustic it can be. The dilution protocol aims to bring the pH up to a safer range, but he still prefers you avoid it altogether. The skin’s microbiome produces its own acidity, so adding external acid is rarely necessary.

Berg emphasized that essential oils like cedarwood and tea tree are extremely strong and often trigger irritation when applied undiluted to the delicate facial skin. He suggested that while they may be safe on other body parts, the face requires extra caution due to sensitivity and the risk of permanent damage. He added that bergamot, in particular, carries a phototoxic risk — combining it with sunlight can cause severe inflammation, a condition known as phytophotodermatitis. Patch testing is the first line of defense against an immediate bad reaction, but users must still consider long-term phototoxicity.

Berg expressed confusion as to why people put toothpaste on their face, given that it contains ingredients designed to remove stains and kill bacteria in the mouth — not to care for delicate facial skin. He pointed out that hydrogen peroxide is a bleaching agent and fluoride can be irritating. Instead, he suggested vitamin C serums, which are antioxidant-rich and gentle, or the active compound in aspirin (salicylic acid), a well-known acne treatment. This advice repositions spot treatment from a potentially damaging hack to a dermatologically sound alternative.

Berg explained that rubbing alcohol and hydrogen peroxide indiscriminately kill microbes, which is detrimental because the face needs a healthy bacterial population. He compared the overuse to pasteurizing the skin — wiping out everything good along with the bad. The result is a disrupted barrier, increased sensitivity, and a higher risk of rosacea. He also warned against facial creams that contain alcohol, as they similarly dry and sterilize the skin.

Berg connected his high school acne experience to illustrate the harm of over-exfoliation. He scrubbed his face daily, thinking he was cleaning it, but instead exacerbated redness, irritation, and breakouts. He frames exfoliation as a microbiome disruptor: each scrub removes the protective layer of microbes that keep pathogenic bacteria in check. The lesson is that healthy skin isn’t about being scoured clean; it’s about preserving the skin’s natural ecosystem. Occasional, gentle exfoliation can aid cell turnover, but daily use turns a helpful practice into a chronic irritant.

Berg described topical steroids as synthetic anti-inflammatories that 'shut the immune system down' locally. While they reduce redness in the short term, regular use disrupts normal skin physiology. The skin becomes paper-thin, blood vessels become visible, and the loss of collagen leads to stretch marks and deep creases. Moreover, suppressing immunity on the face allows unfriendly bacteria to overpopulate, ironically worsening the very conditions people are trying to treat. He strongly advises against long-term use on the face, labeling it a dangerous practice that many people don’t question.

Berg explains that every square centimeter of skin carries over a million microbes that create the acidic environment essential for barrier function. He likens the skin to fertile soil: if you sterilize it with alcohol, hydrogen peroxide, or alkaline substances like baking soda, the beneficial microbes die off and harmful organisms can overgrow, leading to redness, rashes, acne, and conditions like rosacea. This perspective shifts the focus from killing bacteria to preserving the skin’s ecology, making the acid mantle a living, dynamic shield rather than a chemical film.

Berg introduces the term 'phyto photodermatitis' (plant + light + skin inflammation) to explain why common kitchen staples can become dangerous. The phytonutrients (furocoumarins) in citrus and bergamot react with UV light, causing burns, blisters, and long-lasting hyperpigmentation. He stresses that this is an uncommonly known condition, and even popular perfumes containing bergamot can trigger it. The takeaway is never to put these plant-based extracts on the face before going outside.

Berg explains that topical steroids work by shutting down the local immune response, which reduces inflammation — but at the cost of halting skin cell renewal and collagen production. Over time, the skin becomes paper-thin, revealing blood vessels and losing its underlying scaffolding (atrophy). He notes that this can lead to overgrowth of unfriendly bacteria because the immune system is suppressed, causing rosacea-like redness and serious pigmentation irregularities. His message is clear: the face is not a suitable site for prolonged steroid use, and many people unwittingly cause long-term damage.

Berg equates daily exfoliation with 'scrubbing off the microbiome,' effectively sterilizing the face. He recalls that in high school, when he struggled with acne, he exfoliated constantly — and his skin only became redder, more irritated, and more acne-prone. He emphasizes that occasional exfoliation is fine, but doing it daily disrupts the acid mantle and the microbial ecosystem that normally keeps harmful bacteria in check. The deeper message is that healthy skin isn’t about being sterile; it’s about balance.

Berg points out that the skin’s natural pH is already acidic (4.5–5.5), but undiluted ACV is hundreds to thousands of times more acidic than the skin’s mantle. He shares that he once sprayed ACV on his lawn to control weeds, and it killed all the grass within two days — a direct demonstration of its caustic potential. Applying it undiluted to the face will cause intense redness, irritation, and a compromised barrier. While he gives a dilution protocol as a harm-reduction measure, he warns that even diluted, it’s not something the average person needs on their face.