The answer is that you don't need to wait. Once a product's pH is established (and if it's a good formula) it will hold steady for while you apply other products afterward, and it takes time for their pH to change.
You don't need to wait for the BHA or AHA to absorb or dry; you can apply any other product in your routine - moisturiser, serum, eye cream, or sunscreen - immediately afterwards. Experiment with different strengths of glycolic acid or salicylic acid to see which concentration gives you the best results.
Wash hands after use. If using cleansers containing salicylic acid, wet the affected area. Gently rub the cleanser into the skin for 10 to 20 seconds. Do not scrub the skin.
You can do heavy peels once every few weeks (such as 15% salicylic acid), but using it consistently every day is much effective, safer, and more beneficial. Salicylic acid creams that are only 1% or 2% in strength, you can leave it overnight on the skin and rinse it off in the morning.
Skin purging occurs because of some ingredients that accelerate your body's natural process of getting rid of dead skin cells. Products that contain certain components—including lactic acid, salicylic acid, glycolic acid, and retinoids—are likely the culprits of your acne breakout.
Should I moisturise after salicylic acid? Yes, it's considered best for your skin and the protective skin barrier to apply a moisturiser after using salicylic acid.
Signs that treatment is effective
Wart medications, such as salicylic acid, gradually peel away layers of a wart until it reaches the same level as the skin. People may notice the wart becoming flatter over time.
Salicylic acid works to treat acne by unclogging blocked pores. It does this by breaking down the bonds between dead skin cells so that they can release from the pore more easily, and breaking down oils, such as sebum. Salicylic acid also decreases the skin's sebum production, leading to fewer breakouts.
Here's the not-so-great thing about salicylic acid: It takes a minute to see it work. “You'll likely see results in four to six weeks,” says Dr. Nazarian, “after which you should continue to use it for long-term effects.” That means you shouldn't expect any miracles overnight—good skin requires patience, y'all.
Salicylic acid starts working by 2-3 weeks, and takes around 2-3 months to show full effect. This potent antioxidant reduces pigmentation and builds up skin collagen. You will start noticing a brighter complexion in 4-6 weeks but actual improvements, in terms of dark spots reduction, will take around 3-4 months.
It is advised by some skincare experts that using a salicylic acid product overnight enables the ingredient to work without being disturbed with the exposure to free radicals, such as pollution or UV rays.
Some may find their skin is itchy, others may notice areas of redness, flaky patches of skin, and even painful to touch. If you experience any of these, even in the mildest state, stop using your product containing salicylic acid and seek the help of a dermatologist.
"If salicylic acid is an ingredient in your cleanser, it is fine to use it every day." However, if you are using an exfoliant that has salicylic acid in the formula, Dr. Hu advises only using the product three times per week, to avoid over-exfoliating the skin and drying it out.
“Letting these products work their way into the skin for 60 to 90 seconds will do the job, or clearing pores and removing dead skin cells to provide a healthy glow.”
Salicylic acid will help open up your pores, and the newly unclogged pores will require proper hydration to keep your skin healthy and fresh. Thus, it is recommended to layer your skin with moisturizing ingredients such as hyaluronic acid after applying the salicylic serum.
For example, if you use a salicylic acid-based cleanser, make sure that this ingredient isn't in your toner or moisturizer. Using the ingredient in each step of your routine can dry out your skin and worsen your acne. It's also important to wear sunscreen every day.
AHAs and BHAs, such as glycolic, salicylic, and lactic acids should never be used with Vitamin C. Vitamin C is an acid, too, and is unstable, so the pH balance will be thrown off by layering these ingredients together and might as well be useless.
Acne treatments — especially those that contain active ingredients like benzoyl peroxide and salicylic acid — are drying and a bit harsh on your skin. If you use too many treatments at the same time, your skin may become irritated, and you may actually suffer more breakouts as a result.
Products that may cause purging
Retinoids such as Tretinoin, acids such as salicylic, and benzoyl peroxide are just a few of the products that cause purging. These products contain active ingredients that increase the skin cell turnover rate, therefore causing your skin to purge.
What Does Skin Purging Look Like? Purging breakouts look like tiny, red bumps on the skin that are painful when touched. Often, there may be whiteheads and blackheads that appear along with the bumps.
Sudden acne breakouts can be because of numerous reasons, including hormonal changes or hormonal imbalance, an unhealthy diet including lots of deep fried and junk food, release of cortisol hormones because of excessive stress, excessive production of sebum and much more.