How to beat crusty skin, acne and cruel psoriasis: Experts reveal the affordable skincare ingredient that has taken beauty insiders by storm... and the products that contain it

What do the top-selling skincare products of Tower 28, Mario Badescu and Clinisoothe+ have in common? They’re all facial sprays claiming to calm visible redness, prevent breakouts, support the skin barrier and even fight common bacterial skin problems like acne, eczema and psoriasis. 

And the active ingredient in these mists that’s been touted as the cure-all: hypochlorous acid. So what exactly is it? Are these claimed benefits true? And is it safe to use on your face? We spoke to Consultant Dermatologist Dr Anjali Mahto.

What is hypochlorous acid?

Hypochlorous acid isn’t a new ‘miracle’ ingredient. In fact, it’s a natural byproduct of your body’s immune response, produced by your white blood cells, to fight off bacteria and infections. For example, when you accidentally cut your finger, your body will produce hypochlorous acid to fight off any germs.

Its strong antimicrobial properties are replicated in the science world (hypochlorous acid is more powerful than bleach as a disinfectant, which is why it’s commonly used in alcohol-free hand sanitisers and surface cleaners) and the medical world (it can clean wounds without damaging skin the way alcohol or hydrogen peroxide can).

So, how did it end up in our skincare? First thing’s first: hypochlorous acid needs to be properly diluted before it’s safe to use on your skin. But the claim that it’s effective in killing bacteria whilst being gentle on the skin holds up. ‘Hypochlorous acid is a naturally occurring molecule that helps to fight infection and reduce inflammation,’ confirms Dr Mahto.

She explains that it’s replicated in skincare in low concentrations as a topical solution to calm and cleanse the skin. ‘It has powerful antimicrobial and soothing properties, making it particularly useful for compromised or reactive skin, without the sting or irritation associated with many other antiseptics.’

What are the benefits of using hypochlorous acid?

As it mimics the antimicrobial and anti-inflammatory properties of the hypochlorous acid your body naturally produces, using a hypochlorous acid facial spray offers two main skin benefits: it will kill bacteria and reduce inflammation.

‘Hypochlorous acid is effective against bacteria, viruses and fungi, making it ideal for acne-prone skin,’ says Dr Mahto. Its antimicrobial properties will kill the acne-causing bacteria without damaging the skin barrier or causing dryness (unlike alcohol-based products or popular acne treatments such as benzoyl peroxide), help prevent future breakouts and support the healing of existing blemishes.

And it gets better. It’s also an effective treatment for common skin conditions such as rosacea, eczema and psoriasis thanks to its anti-inflammatory properties. ‘Hypochlorous acid helps reduce redness, soothes inflammation and speeds up skin healing,’ explains Dr Mahto, making it 'an excellent option for those with sensitised or inflamed skin.’  

The best hypochlorous acid sprays

Is hypochlorous acid safe for skin?

Some hypochlorous acid mists have a pool-like chlorine smell, which fades after application. While it might smell like something you shouldn’t be spraying on your face, it is very safe to use on skin – and that includes sensitive, rosacea-prone or acne-affected types.

Hypochlorous acid is non-irritating, doesn’t damage the skin barrier and most formulas are pH-balanced and free from alcohol or fragrance, making them suitable even for children or post-procedure skin. ‘Its safety profile makes it an excellent option for daily use or as a skin-calming rescue product,’ Dr Mahto adds.

Are there any risks?

According to Dr Mahto, risks are minimal but as with any product, individual sensitivities can occur. ‘Very rarely, someone might experience mild stinging or dryness. Always check the ingredients if you have allergies,’ she recommends. ‘And ensure you’re using a reputable brand, as the pH balance is essential for both efficacy and safety in hypochlorous acid solutions.’ She uses Clinisept+ in her clinic..

How do you use hypochlorous acid?

You’ll typically find hypochlorous acid in mists or liquid liquid solutions. Because it’s so gentle, it can safely be used multiple times a day and alongside acids and retinoids without disrupting the skin barrier. Simply spray onto clean skin after cleansing (there is no need to rinse it off) before other actives. If there is any concern about irritation, it can be gradually introduced to help support skin barrier function.

Who should use hypochlorous acid?

Because it’s so gentle, almost everyone will benefit from adding some hypochlorous acid to their skincare routine without irritation or barrier disruption, especially those with acne, rosacea, eczema or inflamed skin.

It’s also great post-treatment (like after laser), as it reduces the risk of infection and calms irritation. And it’s excellent for post-procedure care, as it helps to prevent infection and reduce downtime.

Travellers and frequent mask-wearers may also find it helpful to keep skin balanced.