Goodbye and Thank You! Arithmetic is Closed.

Posted on March 25, 2016 by Andy Bosselman


I appreciate all of you who have believed in and supported Arithmetic.

We created incredible products that achieved a cult following and accolades from the world's top beauty editors. I'm proud of that, and we couldn't have done it without customers like you.

Many of our thousands of passionate customers will be disappointed in our decision to close the business. But it's time to move on. Thanks again.

Andy Bosselman

The Ultimate Guide to Moisturizers for Acne-Prone Skin

Posted on March 24, 2016 by Erin McKelle


Many assume that you shouldn't use moisturizers if you have breakouts or acne-prone skin. But that's not true, you just need to use the right kind!

Not all moisturizers are created equally and using the wrong kind can send your skin into a downward spiral. To help you to keep your skin hydrated while still fighting off acne, here are a few great ones that will work wonders

1. Clinique Dramatically Different Moisturizing Gel $14.50

This moisturizer is made specifically for oily, acne-prone skin and has been used by yours truly! I’ve known many others who also swear by this moisturizer, since it’s great for hydrating while not making your skin even more oily than it already is.

2. Burt’s Bees Natural Acne Solutions Daily Moisturizing Lotion $17.99

This moisturizer was formulated to keep irritation at bay, thanks to its essential oil contents, as it contains witch hazel and lemon grass, as well as salinic acid. Burt’s Bees products are also known for being very natural and non-toxic, so this is a great option for organic beauty lovers.

3. CeraVe AM Facial Moisturizing Lotion $12.74

This moisturizer includes SPF 30, which will keep you protected from the sun’s UVA and UVB rays. This formula is oil free, so it won’t cause your pores to further clog with excess oil and also includes an anti-inflammatory agent, niacinamide.

4. Eucerin Calming Cream Daily Moisturizer $0.99

If you have sensitive skin and need to use only the most gentle moisturizers out there, give Eucerin a try! I absolutely love Eucerin, as it’s very soothing, contains no fragrances, and is non-comedogenic. It also contains oatmeal, which is a great natural acne reliever.  It also happens to be oatmeal month, making this the perfect time to celebrate this product.

5. Fresh Umbrian Clay Oil-Free Lotion $39.00

Clay is a great natural acne reliever, as it helps to soak up excess oil that clogs pores. The product is also filled with cucumber extract, which helps to relieve inflammation and more extracts than I can list!

6.  Kiehl’s Ultra Facial Oil-Free Lotion  $26.50

This moisturizer is oil-free, essential for anyone with acne-prone skin, and contains Vitamin E, cylindrica root extract, and antarcticine to help soothe irritated skin and heal any blemishes.

7. EltaMD UV Clear SPF 46 $22.50

I can’t emphasize the importance of sun protection enough! This formula contains SPF 46, giving you one of the highest levels of protection available. It’s oil free and made specifically for sensitive and problem skin. This product is great to layer with another moisturizer, as it’s technically a facial sunscreen and won’t give your skin the nourishing properties it needs on the hydration side of things.

  • Erin McKelle is a feminist blogger and freelance writer whose work has appeared in Bustle, The Huffington Post, and Beautycon. @ErinMcKelle
  • About Us: Arithmetic is a new skincare company focused on helping adults achieve clear, healthy skin.
  • We make the cult-favorite Acne Control Complex spot treatment.

Posted in healthy chemicals, healthy skin, hydrate, hydration, ingredients, moisturize, moisturizer, moisturizers, moisturizing, oil, oil-control, oil-free, protect, skincare routine, skincare tips, soothing, sunscreen

Allure Magazine Recommends Our Acne Control Complex Spot Treatment as Part of a Three-Product Cocktail to Combat "Deep, Humungous Cystic" Acne

Posted on March 08, 2016 by Rachel Duran

woman applying cream to cystic acne

Allure Magazine Logo

Struggling with cystic acne? Mix this cocktail of three products, says Allure. "The combination of three over-the-counter products—a sulfur-containing cream, a benzoyl peroxide cream (try Arithmetic Acne Control Complex), and a mild cortisone cream—usually proves very effective when mixed and applied two to three times a day over the cyst for seven to ten days. The cyst will start to significantly reduce in size after two to three days." —Leyda Bowes, the medical director at Bowes Aesthetics in Miami


Posted in acne, adult acne, Allure, angry pimple, cocktail, cycstic acne, cystic pimple, painful pimple, persistent acne, pimple, press, spot treatment

Yahoo! Beauty Suggests Our Acne Control Complex to Help You "Get Strategic" with Low-Dose Benzoyl Peroxide

Posted on March 04, 2016 by Rachel Duran

Yahoo! Beauty suggested our Acne Control Complex to help you "get strategic" with low-dose benzoyl peroxide. "Because it delivers three benefits: normalizing oil production in the gland itself, cleaning pores and acting as an antibacterial agent." 

Posted in acne control complex, benzoyl peroxide, low-dose, press, sensitive skin, Yahoo! Beauty

7 Celebrities Who Struggle with Breakouts and Adult Acne

Posted on February 11, 2016 by Erin McKelle

woman with pimple

Although you wouldn't know it thanks to professional makeup and Photoshop, many celebrities struggle with breakouts and adult acne. For celebrities, the pressure to look perfect is even more taxing than it is for everyday people like me Imagine a life if revealing imperfect skin could keep you from getting your next job,, not to mention thousands of critical comments if you posted a less-than-pretty Instagram selfie?

Nevertheless, celebrities are just human, many of deal with acne  just like the rest of us. Here are a few of their stories, maybe you can relate.

1. Cameron Diaz


The actress has chronicled her struggle with acne in The Body Book and her aesthetician Christopher Watts told NewBeauty. about the treatments she uses to treat it. She's conscious of it and goes to great measures to handle and correct it. I regularly do microdermabrasion on her, with a lactic acid peel,” he said. He added that she also likes to use LED light treatments to help to “lessen breakouts.”

2. Kelly Clarkson


The American Idol winner has been a spokesperson for acne treatment system Proactiv, after battling acne while in the spotlight. “I just break out, like, all on my chin and I already have enough people judging everything I do, I don’t want them judging my skin,” she has said. She credits the stress of her job for causing her acne to flare up and I can only imagine how true that must be.

3. Harry Styles


The former One Direction singer has talked about his acne before, which has also been a major source of media speculation. "I wear so much spot cream at night, I have more on than my mum,” he once told the Daily Star.

4. Adam Levine


Adam Levine is also a spokesperson for Proactiv, who suffered from acne while he was in high-school, which he recounts as having made him “insecure.” "When I was in high school and had acne, I spent a lot of time sulking in my room and being upset," he told E! News.

5. Emma Stone


Emma has suffered from acne as a teen and broke out badly while she was filming her breakout role in the movie Easy A."... I had bad hormonal acne when I was 17, and they put me on Accutane for it...since then, my skin, my mouth, my lips, my eyes are all so dry. Then, I had stress acne when I was 20, when I did 'Easy A', which they kindly video-airbrushed out of the movie,” she told Refinery29 in an interview.

6. Keira Knightley


The gorgeous actress has also suffered from acne and has felt insecure about it. “I'm incredibly self-conscious about the fact that I get bad skin, she told Australian Vogue in an interview. Despite this, I’m sure we all still consider her to be a knockout.

7. Brad Pitt


Brad Pitt is arguably one of the most famous actors in the world and considered to be incredibly handsome, but the star has suffered from acne, once upon a time. See, even the hottest people in the world get acne, too!

8. Katy Perry


Katy is a celeb who has had to deal with public scrutiny about her skin, which was something she used to feel insecure about. "My skin used to be a lot more worse than it is, so we would do a lot of coverage because I was insecure about my skin,” she told Vogue.

  • Erin McKelle is a feminist blogger and freelance writer whose work has appeared in Bustle, The Huffington Post, and Beautycon. @ErinMcKelle
  • About Us: Arithmetic is a new skincare company focused on helping adults achieve clear, healthy skin.
  • We make the cult-favorite Acne Control Complex spot treatment.

Posted in adult acne, adult ance and hormone, brad pitt, cameron diaz, empowerment, gender, guys, harry styles, health, katy perry, kelly clarkson, kiera knightly, model, persistent adult acne, photo, post-acne, self confidence, self-love

What Is My Skin Type? This Simple Checklist Has the Answer

Posted on February 04, 2016 by Erin McKelle

woman smiling

Everyone’s skin gets dry skin in the winter. But does that mean your skin type is dry? Skin care products and tips are often centered around skin type—but if you’re not sure what yours is, the information can often be confusing, contradictory, or misleading.

This simple checklist will allow you to determine what type of skin you have. If you answer “yes” to the questions under each headline, that means you’ve found your skin type. Also, keep in mind that your skin type can change as you age.

Oily Skin:
  • Does your t-zone get shiny during the afternoon?
  • Do you have large, visible pores?
  • Are you constantly dealing with breakouts?
  • Does your complexion look and feel greasy?

  • If you answered “yes” to at least three of these questions, then you probably have oily skin. It is is commonly characterized by having a lot of, well, excess oil. Essentially, oily skin is caused by your glands secreting too much oil that causes your skin to become irritated and break out.

    Dry Skin:
  • Does your skin start to flake in the afternoon?
  • Does your complexion look dull and often feel itchy?
  • Are you suffering from cracking, red patches, or bleeding?
  • Do your symptoms get worse during cold weather?

  • If you identify with these questions, than you likely have dry skin. A lack of moisture is heightens the symptoms of dry skin, which is why a lack of humidity can affect your complexion. If you have dry skin, you’re probably not doing enough to lock in moisture (there’s more to it than just wearing moisturizer).

    Combination Skin:
  • Is the skin in your t-zone oily and dry on the rest of your face?
  • Do you suffer from breakouts and dry patches?
  • Do you find yourself using different products for different parts of your face?
  • Could you identify with both the dry and oily skin questionnaires?

  • Combination skin is actually the most common skin type and is often caused by hormone imbalances and genetics, so you can thank your parents for your combination skin. There might not be much you can do, but treating your dry skin and oily skin separately is actually a good idea.

    Now, there are two other sub-skin types that you might also identify with. What is called “normal” skin essentially boils down to not experiencing many skin abnormalities or suffering from breakouts, oil, or dryness. If this is you, consider yourself lucky.

    You could also have skin that easily redens or is easily irritated, which indicates having sensitive skin. If you have sensitive skin, use new products with caution and try to keep a consistent skin care routine to prevent flare ups.

    Now, go forth and treat your skin type!


    • Erin McKelle is a feminist blogger and freelance writer whose work has appeared in Bustle, The Huffington Post, and Beautycon. @ErinMcKelle
    • About Us: Arithmetic is a new skincare company focused on helping adults achieve clear, healthy skin.
    • We make the cult-favorite Acne Control Complex spot treatment.

    Posted in adult ance and hormone, blemishes, dry skin, dryness, healthy skin, hormonal acne, jawline acne, normal skin, oil, oil-control, oily skin, persistent acne, sensitive, sensitive skin, sensitivity, skin, skin care, skin type, skin types, skincare

    GQ Magazine Recommends Our Aloe + Zinc Shave Cream

    Posted on February 02, 2016 by Rachel Duran

    GQ Mgazine Article

    GQ Magazine

    Simplifying your morning routine or just cleaning out your medicine cabinet? GQ suggests our Aloe + Zinc Shave Cream among the multi-tasking products to streamline your routine and still manage to look your best. 

    "Razor burn, bumps, and ingrown hairs blow. So cut them off at the pass with a cream that soothes while you shave."

    Posted in gq magazine, minimalist, press, shave cream

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