Acanthosis Nigricans: Causes, Symptoms and Treatment

Written by Medicover Team and Medically Reviewed by Dr Girishma J , Dermatologists

Causes
Find a Doctor
Diagnosis
Treatment
FAQs
Book an Appointment

1. Causes 2. Find a Doctor 3. Diagnosis 4. Treatment 5. FAQs

Acanthosis Nigricans is a skin condition characterised by dark, thick, and velvety patches that usually appear in body folds such as the neck, armpits, under the breasts, Elbows, knees, knuckles, and groin. In some cases, the face, especially around the mouth or forehead. It is commonly associated with insulin resistance, obesity, hormonal disorders, or certain medications. While not contagious, it can be a sign of an underlying health condition that may need medical attention. Treatment focuses on managing the underlying cause and improving the skin's appearance.

What are the Different Types of Acanthosis Nigricans?

Acanthosis Nigricans is not a single condition. It can happen for different reasons, and understanding the type can help guide treatment.

Obesity-Related AN: The most common type. Linked to high insulin levels and excess body weight.
Hereditary (Congenital) AN: Appears from birth or early childhood. Usually runs in families.
Drug-Induced AN: Caused by certain medications like steroids, birth control pills, or hormone treatments.
Malignant AN: A rare and severe form. It may be linked to internal cancers, especially stomach or liver cancer. Needs immediate medical attention.
Syndromic AN: Occurs as part of rare genetic syndromes or hormonal disorders like PCOS, thyroid problems, or insulin resistance.

What are the Acanthosis Nigricans Symptoms and Warning Signs?

Acanthosis Nigricans (AN) is often easy to spot once you know what to look for. Early detection can help you manage the condition better and may also reveal underlying health issues like prediabetes, obesity, or hormonal imbalance.

Common Acanthosis Nigricans Symptoms

Dark patches on the skin, usually brown or black
Skin that feels soft and velvety to the touch
Slow and gradual thickening of the affected areas
Mild itching or irritation (in some cases)

These changes often appear on the neck, underarms, groin, or elbows.

Severe Symptoms of Acanthosis Nigricans

Sudden appearance of new dark patches
Bad body odour from the affected areas
Small skin growths (skin tags) are forming near the dark patches

If you notice rapid changes in your skin or new spots appearing quickly, consult a doctor.

What are the Common Causes of Acanthosis Nigricans?

Understanding what causes it and what might increase your chances of developing it can help you take early steps toward better health. Several medical conditions and lifestyle factors can lead to Acanthosis Nigricans. These include:

High insulin levels: The most common cause is insulin resistance, which happens in people with obesity, type 2 diabetes, or prediabetes.
Hormonal disorders: Conditions like hypothyroidism (underactive thyroid), polycystic ovary syndrome (PCOS), and adrenal or pituitary gland disorders can trigger skin changes.
Certain medications: The long-term use of certain medications, such as birth control pills, corticosteroids, or hormone treatments, can cause this skin condition.
Growth hormone therapy: Treatment for growth issues in children or adults may sometimes be linked to Acanthosis Nigricans.
Genetics: In some people, especially children, the condition may be present from birth due to inherited traits.
Rare internal malignancies: In rare cases, Acanthosis Nigricans may be associated with certain cancers, especially of the stomach or liver. This is more likely in older adults and is usually accompanied by other serious symptoms.

When to See a Doctor?

Knowing when to seek medical help for Acanthosis Nigricans is important. Early consultation can prevent complications and help detect underlying health issues before they get worse:

New dark patches or changes in skin texture.
Skin that becomes itchy, smells bad, or feels irritated.
Skin thickening in folds like the neck, armpits, or groin.
Sudden changes in skin without an obvious reason.
A personal or family history of hypothyroidism, obesity, type 2 diabetes, prediabetes, PMOS(Polycystic Metabolic Ovary Syndrome) or hormone-related conditions.

If you fall into any of these categories, it's important to consult a dermatologist or endocrinologist early. Timely diagnosis and treatment can help manage the condition and prevent further skin changes.

Find Dermatologists for Acanthosis Nigricans Treatment Near You

How is Acanthosis Nigricans Diagnosis Performed?

Acanthosis Nigricans is often easy for doctors to identify with a simple physical exam.

Physical Examination: A dermatologist or general physician will examine the affected areas to check for common signs and patterns of Acanthosis Nigricans.
Blood Tests: These are done to check for high blood sugar, insulin resistance, thyroid function, or other hormonal imbalances.
Skin Biopsy (Rare): If the diagnosis is unclear or if the skin changes seem unusual, a small sample of skin may be tested in the lab. This helps rule out more serious causes, like cancer.

What are the Treatment Options for Acanthosis Nigricans?

While Acanthosis Nigricans can affect a person's appearance and confidence, the good news is that it is treatable, especially when the root cause is addressed.

Weight Management Programs: If insulin resistance or obesity is a factor, we offer medically supervised weight loss plans. These include customised diet charts, exercise guidance, and regular follow-ups.
Lifestyle Counselling: Our experts help patients develop sustainable routines that include balanced meals, physical activity, and healthier habits.
Blood Sugar Control: If diabetes is diagnosed, treatment may include oral medicines or insulin to regulate blood sugar levels.
Topical Treatments: Retinoid creams, skin-lightening agents, or exfoliating lotions may help improve the skin's texture and tone over time.
Laser Therapy and Dermabrasion: In select cases, cosmetic procedures such as laser treatment can help reduce the appearance of thickened patches.
Antibiotic Creams or Tablets: These may be prescribed if the skin becomes irritated, has an odour, or shows signs of infection.
Medicine Review: If a certain medicine is found to be causing the condition, our doctors may suggest switching to a safer alternative.

What to Expect During Recovery

Every patient's recovery journey is different. For many, skin changes begin to improve within 2 to 6 months once the underlying cause is managed. Consistency in treatment and follow-up visits is key.

Visible results depend on the severity of the condition and how well other health issues, such as blood sugar or hormone levels, are controlled.

Your health is everything - prioritize your well-being today.

Consult Acanthosis Nigricans Doctors Today

What are the Risk Factors of Acanthosis Nigricans?

Some individuals are more likely to develop Acanthosis Nigricans due to their underlying health conditions, lifestyle, or genetic background. These risk factors include:

Being overweight or obese: Excess body weight is the strongest risk factor, especially in children and young adults.
Family history: If close family members have had Acanthosis Nigricans, the chances of developing it are higher.
Ethnicity and skin tone: People with darker skin tones, especially those of African, Hispanic, Native American, South Asian, or Caribbean origin, are more prone to this condition.
Metabolic syndrome: Having multiple risk factors like high blood pressure, high blood sugar, and excess body fat can increase your risk.
Insulin resistance: Conditions like prediabetes and type 2 diabetes are strongly linked to this skin change.

What are the Prevention Tips for Acanthosis Nigricans?

Some simple and practical habits that can help prevent Acanthosis Nigricans and the conditions associated with it:

Maintain a Healthy Weight: Obesity is one of the most common triggers of AN. Losing even a small amount of weight can help reduce symptoms and prevent new skin changes.
Follow a Balanced, Low-Glycemic Diet: Choose foods that help control blood sugar, such as whole grains, fresh vegetables, legumes, and lean proteins. Avoid excess sugar, white bread, and processed snacks.
Stay Physically Active: Regular exercise improves insulin sensitivity and helps regulate hormone levels. Aim for at least 30 minutes of activity most days of the week.
Monitor Blood Sugar Levels: If you have diabetes, prediabetes, or a family history of these conditions.
Avoid Unsupervised Use of Hormonal Medications: Long-term use of steroids or hormonal treatments should always be done under medical guidance, as they can affect insulin and hormone levels.
Manage Underlying Health Conditions: Conditions such as thyroid disorders, polycystic ovary syndrome (PCOS), and insulin resistance should be regularly monitored and treated to ensure optimal health.