Hydroquinone lightens the skin when applied topically by inhibiting tyrosinase, the enzyme responsible for converting the amino acid tyrosine to the skin pigment melanin, and is used to treat acne-associated postinflammatory hyperpigmentation. By interfering with new production of melanin in the epidermis, hydroquinone leads to less hyperpigmentation as darkened skin cells are naturally shed over time. Improvement in skin hyperpigmentation is typically seen within six months when used twice daily. Hydroquinone is ineffective for hyperpigmentation affecting deeper layers of skin such as the dermis. The use of a sunscreen with SPF 15 or higher in the morning with reapplication every two hours is recommended when using hydroquinone. Its application only to affected areas lowers the risk of lightening the color of normal skin but can lead to a temporary ring of lightened skin around the hyperpigmented area. Hydroquinone is generally well-tolerated; side effects are typically mild (e.g., skin irritation) and occur with use of a higher than the recommended 4% concentration. Most preparations contain the preservative sodium metabisulfite, which has been linked to rare cases of allergic reactions including anaphylaxis and severe asthma exacerbations in susceptible people. In extremely rare cases, repeated improper topical application of high-dose hydroquinone has been associated with an accumulation of homogentisic acid in connective tissues, a condition known as exogenous ochronosis.
How to Handle It: Pair two of the best-known acne-fighting ingredients, salicylic acid and benzoyl peroxide, in the week leading up to your period. (If you're feeling bloated, now's the time to do it.) The combo can help prevent hormonal acne from happening in the first place. Zeichner suggests following a salicylic acid wash, like fan-favorite Neutrogena Oil-Free Acne Wash Pink Grapefruit Facial Cleanser ($7), with a benzoyl peroxide spot treatment, such as Murad Acne Spot Fast Fix ($22). If you're still seeing zits, "visit your dermatologist to discuss prescription options, like birth control pills, oral spironolactone — which blocks oil — or topical Aczone 7.5 percent gel," says Zeichner. "It's shown to be particularly effective in adult women without causing irritation." Oral contraceptives level out those hormone fluctuations, keeping your oil production normal and your skin clear.
If you have oily, tight skin and tend to get age spots or sun spots, try an exfoliant made with glycolic acid right after you cleanse your skin, no more than 4 or 5 times a week. Aveeno Positively Radiant Cleansing Pads provides just a “dab” of exfoliant that will help lighten the spots without irritating your skin (which over the long run would create new brown spots).
The use of antimicrobial peptides against P. acnes is under investigation as a treatment for acne to overcoming antibiotic resistance. In 2007, the first genome sequencing of a P. acnes bacteriophage (PA6) was reported. The authors proposed applying this research toward development of bacteriophage therapy as an acne treatment in order to overcome the problems associated with long-term antibiotic therapy such as bacterial resistance. Oral and topical probiotics are also being evaluated as treatments for acne. Probiotics have been hypothesized to have therapeutic effects for those affected by acne due to their ability to decrease skin inflammation and improve skin moisture by increasing the skin's ceramide content. As of 2014, studies examining the effects of probiotics on acne in humans were limited.
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When you sign up for membership (online or in Acne Studios’ physical stores), Acne Studios collects your name, address, e-mail address, telephone number, country of residence, date of birth, title (Ms./Mr. or other title) and social media account contact details. Acne Studios processes the data to create your personal account and to process the membership which includes certain features such as (i) sending digital receipts upon request when purchasing a product in a physical store, (ii) sending out invitations to special events/promotions, (iii) personalized services in store, and (iv) profiled marketing offers through email, SMS, letters, telephone, WeChat, Whatsapp and other social media. The legal basis is that the processing is necessary in order for us to be able to fulfill our contractual obligations to you under the Membership Policy. We will retain your data for as long as necessary for this purpose.
Low concentrations of salicylic acid, like 0.5 percent, are perfect for people who have both acne and sensitive skin. If you have sensitive skin, you know that most of the “best” acne medications just don’t work for you because they are too strong. Products that are too strong for you can cause increased inflammation, which can actually lead to more acne rather than less. Because of this, salicylic acid is our number one recommendation for sensitive skin.
For the purpose of sending out invitations to special events/promotions, personalized services in store and profiled marketing offers through email, SMS, letters, telephone, WeChat, Whatsapp and other social media. The legal basis is that the processing is necessary in order for us to be able to fulfill our contractual obligations to you under the Membership Policy.
Credit card details: If you make a purchase online and choose to pay by credit card, you will provide your credit card information on our website to finalize your purchase. Your credit card details will be protected using Global Sign Encryption. The legal basis is that the processing is necessary in order for us to be able to fulfill our contractual obligations to you under the purchase agreement. We will retain your data for as long as necessary for this purpose.