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Why Do I Have Dark Spots in My Armpits?

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You probably don’t think much about your armpits. Keeping them odor free and clean is probably your priority. But if you’ve stumbled on this article, you’ve probably noticed dark spots or coloring in your armpits. The good news is that it’s normal and probably not anything to worry about.

What causes dark spots in my armpits?

There are several reasons why you might have those dark spots. Here are some possible causes:

  • Shaving: Shaving can cause irritation and inflammation in the skin, which can lead to the formation of dark spots. This is especially common in areas where the skin is sensitive, such as the armpits.

  • Antiperspirant or Deodorant: Some antiperspirants contain ingredients that can irritate the skin and cause dark spots. If you have allergies or a sensitivity to ingredients in your product, that might be another cause.

  • Sweat: Sweat can cause the skin to darken over time, especially in areas where the skin rubs together, such as the armpits.

  • Hormonal changes: Hormonal fluctuations, such as those that occur during pregnancy or menopause, can cause changes in the skin that lead to the formation of dark spots.

  • Skin conditions: Certain skin conditions, such as acanthosis nigricans, eczema, or psoriasis can cause dark spots to appear in the armpits.

Acanthosis nigricans is a common condition that causes the skin under the arms to become darker and thicker. It can also affect the groin and neck. Acanthosis nigricans is most often seen in people with darker skin and is most common in people of native origin. People who are Hispanics, black, Asian, or even white people with darker skin can also have it. 

The condition is caused by an increase in the production of pigment cells in the skin. It is usually nothing to be concerned about, although it can be an indicator of an underlying condition.

Acanthosis nigricans does have a few specific causes:

  • Insulin resistance: Insulin resistance is a condition in which the body's cells do not respond properly to insulin, a hormone that regulates blood sugar levels. Insulin resistance can lead to an increase in the production of IGF-1, which can cause acanthosis nigricans.

  • Obesity: People who are obese are often insulin resistant and more likely to notice dark skin in their underarms and other areas of their body.

  • Hormonal changes: Hormonal fluctuations, such as those that occur during puberty, pregnancy, or menopause, can lead to changes in the skin that cause acanthosis nigricans.

  • Genetics: Acanthosis nigricans can sometimes be inherited, and it is more common in certain families.

  • Certain medications: Some medications, such as birth control pills and certain hormone replacement therapies, can increase the risk of developing acanthosis nigricans.

  • Cancer: In rare cases, acanthosis nigricans can be a sign of a cancerous tumor.

If you are concerned about acanthosis nigricans, it is best to consult a dermatologist or other healthcare professional for advice.

Getting Rid of Dark Spots in Armpits

If you’ve noticed dark spots in your armpits and are self conscious about them, you do have some options for treatment. 

The easiest and most accessible option is over the counter topical creams. There are products containing ingredients such as retinol or adapalene that can help lighten the skin and reduce the appearance of dark spots. Another option is deodorant that is specifically formulated for discoloration under the arms.

Laser therapy can also be used to lighten the skin and reduce the appearance of dark spots. This can be expensive and results aren’t always guaranteed. If this is something that you are considering, be sure to speak with a doctor or licensed esthetician. 

There are prescription medications available to help lighten those dark spots. This usually happens if a doctor can figure out the underlying cause. Treatments can include hydroquinone or retinoids such as tretinoin. If the dark spots are caused by a hormonal imbalance, birth control pills or hormone replacement therapy may be prescribed.

Making lifestyle changes such as avoiding shaving, using gentle antiperspirants, and maintaining a healthy weight can also help prevent and treat dark spots in the armpits.

Preventing Dark Armpits

If you’re worried about developing dark spots in your armpits, there are a few things you can do to possibly prevent them.

  • Avoid shaving: Shaving can cause irritation and inflammation in the skin, which can lead to the formation of dark spots. Consider using alternative hair removal methods, such as waxing or laser hair removal.

  • Use a gentle antiperspirant: Some antiperspirants contain ingredients that can irritate the skin and cause dark spots. Look for antiperspirants that are labeled as "non-irritating" or "sensitive skin friendly."

  • Wear loose-fitting clothing: Tight clothing can rub against the skin and cause irritation, which can lead to the formation of dark spots. Wearing loose-fitting clothing can help prevent this.

  • Keep the area clean and dry: Sweat and bacteria can accumulate in the armpits, which can lead to the formation of dark spots. Make sure to wash the area regularly and use an antiperspirant or deodorant to help keep the area dry.

  • Avoid exposure to the sun: The sun can cause the skin to darken over time, which can lead to the formation of dark spots. Avoid exposing the area to direct sunlight and use a sunscreen with at least SPF 30 when going outside.

  • Maintain a healthy weight: Because acanthosis nigricans can be triggered by insulin resistance, maintaining a healthy weight may help prevent the condition.

They’re Usually Not a Problem

Dark spots in the armpits can be a concern for many people. While they are usually harmless, they can be a sign of an underlying condition, such as insulin resistance or hormonal imbalances. There are several treatment options available and simple lifestyle changes could also be key. If you are concerned about dark spots in the armpits, it is best to consult a healthcare professional for advice on how to treat them. Visit us to learn about the solutions for the dark spots in the armpit.

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