Understanding Your Acne Test Results: Hormonal and Blood Tests Explained

Acne is a complex, multifactorial skin condition that affects people of all ages. While some breakouts respond to basic skincare routines, persistent or severe acne often requires a deeper, more comprehensive evaluation to uncover its underlying causes. 

Hormonal imbalances, inflammation, and metabolic issues are often at play, which is why dermatologists and healthcare providers may recommend hormonal and blood tests as part of your acne assessment.

In this article, we’ll explain the purpose of common acne-related tests, break down what your results might mean, and show how they guide your treatment options. Whether you’re dealing with chronic breakouts, hormonal fluctuations, or cystic acne, understanding your test results is the key to finding targeted and effective solutions.

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Why Hormonal and Blood Tests Are Used in Acne Diagnosis

Acne is usually diagnosed through a skin exam, but hormonal and blood tests can reveal underlying causes, especially in complex cases. These tests are recommended for adult acne, severe or cystic acne, or when standard treatments fail.

For example, women struggling with irregular periods, excess facial hair or infertility may have conditions like polycystic ovary syndrome (PCOS) that also contribute to persistent acne. Understanding these test results helps clinicians tailor treatment plans to address root causes, leading to more effective, personalized care.

Common Hormonal and Blood Tests for Acne

To accurately identify the underlying causes of persistent or severe acne, clinicians may order several hormonal and blood tests. These tests can reveal imbalances that contribute to acne development and guide more targeted treatments.

Androgen Level Tests (Testosterone, DHEA-S)

Androgens like testosterone and DHEA-S (dehydroepiandrosterone sulfate) regulate sebum (oil) production. Excessive androgen levels can lead to overactive sebaceous glands causing clogged pores and inflammation, which are key contributors to acne.

These tests are useful for identifying hormonal imbalances linked to severe acne, especially in women with conditions like PCOS.

Luteinizing Hormone (LH) and Follicle-Stimulating Hormone (FSH)

LH and FSH are vital for reproductive health and hormone regulation. In cases of hormonal acne, imbalances between these two hormones can be a sign of conditions like PCOS. 

PCOS disrupts a woman’s normal hormonal balance, leads to increased androgen production, causes acne and may cause infertility.

Insulin and Blood Sugar Levels

Insulin resistance, commonly assessed through fasting glucose, insulin levels, and HOMA-IR (Homeostatic Model Assessment of Insulin Resistance), is closely linked to elevated androgen levels. Insulin resistance can exacerbate hormonal imbalances, contributing to acne.

Cortisol and Stress Hormone Tests

Cortisol, the body’s main stress hormone, is often tested when stress is suspected to be a major factor in acne flare-ups. Chronic stress elevates cortisol levels, which in turn increases oil production and leads to inflammation, triggering breakouts.

Reducing stress and normalizing cortisol levels can prevent acne flare-ups and improve overall skin health.

Thyroid Function Tests

Thyroid function tests, including anti-thyroid peroxidase antibodies (Anti-TPO), anti-thyroglobulin antibodies (Anti-TG), TSH (thyroid-stimulating hormone), T3, and T4, help diagnose thyroid imbalances like autoimmune thyroiditis which can worsen acne. 

Interpreting Hormonal Test Results

Understanding your hormonal test results can uncover the underlying causes of persistent or severe acne. Each hormone plays a different role in skin health, and abnormal levels can provide key insights for developing effective treatment plans.

High Androgen Levels

Elevated levels of testosterone, DHEA-S, and other androgens are commonly linked to acne severity.

The overproduction of androgens leads to increased sebum production in the skin. This excess sebum clogs pores, allowing bacteria like Cutibacterium acnes (formerly known as Propionibacterium acnes) to thrive and trigger inflammation. 

The enzyme 5-alpha-reductase exacerbates acne by converting testosterone into the more potent dihydrotestosterone (DHT), which further stimulates oil glands and worsens breakouts.

Key Points for Clinicians:

• Elevated androgens in women suggest a diagnosis of PCOS or adrenal hyperplasia, both of which can cause hormonal imbalances leading to acne. Men with elevated androgens should be assessed for exogenous exposure and adrenal hyperplasia. 

• Clinicians should assess women for other symptoms of androgen excess including irregular periods, hirsutism, or weight gain, to tailor treatment more effectively. In men, persistent acne may be the only symptom of androgen excess.

• High androgen levels often require treatment through hormonal therapies like oral contraceptives, anti-androgens (such as spironolactone), or other hormone-regulating medications.

FSH and LH Imbalance

FSH and LH are key hormones involved in regulating the menstrual cycle and hormone production. In cases of persistent acne, a high LH-to-FSH ratio indicates PCOS, a major cause of acne.

Key Points for Clinicians:

• A high LH-to-FSH ratio is a common indicator of PCOS, which often leads to increased androgen levels and persistent acne.

• Clinicians should assess for other signs of PCOS such as irregular periods, hirsutism, or weight gain, to guide comprehensive treatment.

• Treatment options like hormonal therapies (e.g., oral contraceptives or anti-androgens) can help regulate hormone levels and reduce acne symptoms in PCOS patients.

Insulin Resistance Indicators

Insulin resistance, often identified through elevated hemoglobin A1c, fasting insulin levels and a high HOMA-IR score, is another key factor in acne development. 

Insulin resistance can exacerbate acne by increasing androgen production, which leads to excessive sebum production and clogged pores. Higher insulin resistance markers strongly correlate with more severe acne, indicating that insulin dysregulation might contribute to both the onset and persistence of acne vulgaris.

Key Points for Clinicians:

• Insulin resistance is commonly seen in patients with PCOS or metabolic syndrome, both of which increase the risk of persistent acne.

• Dietary changes (such as reducing sugar and processed foods) and regular exercise are essential to managing insulin resistance and reducing acne.

• In some cases medications like metformin, which improves insulin sensitivity, may be prescribed to address both insulin resistance and associated acne.

Cortisol and Stress-Related Acne

Elevated cortisol levels, particularly in stressful situations, contribute to increased sebaceous gland activity, leading to higher sebum production and exacerbating acne. 

Key Points for Clinicians:

• Persistent high cortisol levels are a strong indicator that stress is a major contributor to a patient’s acne. However, loss of the diurnal cortisol curve may require assessment for adrenal hyperplasia. 

• Stress management techniques including mindfulness practices, regular exercise, and adequate sleep can help reduce cortisol levels and prevent stress-induced breakouts.

• In more severe cases, clinicians may consider prescribing adaptogens or stress-reducing therapies to support cortisol balance and improve skin health.

Thyroid Imbalances and Skin Health

Thyroid autoimmunity, particularly Hashimoto’s thyroiditis, has been linked to persistent acne. Even in cases where thyroid function (TSH, T3, T4) remains normal, the presence of thyroid autoantibodies (anti-TPO, anti-thyroglobulin) can indicate an underlying immune dysregulation that contributes to skin inflammation and acne.

Key Points for Clinicians:

• Patients with autoimmune thyroiditis (AIT) are at a higher risk of developing severe acne, regardless of their thyroid function tests. Clinicians should consider thyroid antibody testing in patients with persistent or severe acne, especially in the setting of other symptoms of hyper- or hypothyroidism.

• The connection between thyroid autoimmunity and acne is likely related to immune dysregulation and inflammation. 

• While not commonly associated with acne, some doctors agree that non-autoimmune hypothyroidism may cause or worsen acne due to buildup of dry, dead skin cells in pores.

Deep Dive: Hormonal Conditions Behind Persistent Acne

While PCOS is a common hormonally-related cause of acne, other hormonal conditions should be ruled out.

Diagnosing and Managing PCOS-Related Acne

One of the most common hormonal conditions driving persistent acne is Polycystic Ovary Syndrome (PCOS). It affects up to 10% of women of reproductive age and is characterized by high androgen levels (male hormones), irregular or absent ovulation, and sometimes polycystic ovaries. 

Insulin resistance, a key feature of PCOS, also increases androgen production, which worsens acne breakouts.

‍Diagnosing PCOS

Blood tests are essential for identifying hormonal imbalances that cause acne in PCOS. Key indicators include elevated testosterone, high DHEA-S, and a high LH-to-FSH ratio. These results often point to PCOS, especially when paired with symptoms like irregular periods and excessive hair growth.

While a common finding, polycystic ovaries on ultrasound are not required for diagnosis.

Managing PCOS

Blood tests can reveal the underlying pathogenesis of PCOS and guide treatment decisions that may include:

• Hormonal Therapy: oral contraceptives regulate cycles and lower androgen levels, reducing acne.

• Anti-Androgens: medications like spironolactone help block the effects of androgens on the skin.

• Insulin-Sensitizing Agents: metformin improves insulin sensitivity, which lowers androgens and may reduce acne.

• Lifestyle Modifications: a healthy diet and exercise support weight management and reduce insulin resistance, helping to control acne.

• Fertility Treatments: for those trying to conceive, treatments like clomiphene or letrozole stimulate ovulation and help balance hormones, potentially improving acne.

Other Hormonal Disorders That Contribute to Acne

Several hormonal conditions beyond PCOS can cause persistent acne, making it important for clinicians to consider these in their differential diagnosis. Each condition affects hormone levels in distinct ways, leading to acne as a symptom of broader hormonal imbalances.

Congenital Adrenal Hyperplasia (CAH) 

A genetic condition affecting cortisol production that leads to excess androgens. Acne in CAH often appears alongside signs of hyperandrogenism, like hirsutism and irregular periods.

Symptoms:

• Early puberty

• Excess body hair

• Menstrual irregularities

• Severe acne

Acne is typically persistent, often severe, and resistant to standard treatment.

Cushing’s Syndrome

Caused by prolonged high cortisol levels, often from long-term steroid use or tumors; acne appears as a result of elevated androgens in Cushing’s.

Symptoms:

• Weight gain (especially around the face and midsection)

• Easy bruising and thinning skin

• Muscle weakness

• Acne and excessive facial hair

Inflammatory facial acne may occur along with redness and increased oil production.

Autoimmune Thyroiditis (AIT)

AIT is an autoimmune disorder that affects thyroid function, leading to immune dysregulation and inflammation that can cause or worsen acne.

Symptoms:

• Fatigue

• Weight gain or loss

• Cold intolerance

• Acne (especially during thyroid hormone fluctuations)

Acne may be chronic or relapsing and slower to respond to treatment compared to those without AIT. People with hypothyroid AIT may have more severe acne than those with hyperthyroid function.

Metabolic Syndrome (MetS)

MetS is a cluster of conditions including insulin resistance, which increases androgen levels and causes acne.

Symptoms:

• Obesity, particularly abdominal

• High blood pressure

• High blood sugar

• Persistent acne, especially along the jawline

In MetS patients, acne tends to be severe and features more widespread inflammatory lesions and nodules, covering larger areas of the face. This acne is often chronic and difficult to treat, and accompanied by scarring and persistent breakouts.

Role of Comprehensive Hormonal Testing

Comprehensive hormonal testing is essential to identify less common conditions contributing to acne. These tests measure hormone levels like cortisol, thyroid hormones, and androgens to pinpoint underlying issues. Identifying and treating the root cause of hormonal imbalances allows for more targeted and effective acne treatment.

What to Do If Your Test Results Are Abnormal

If your hormone test results are abnormal, the next step is to meet with your healthcare provider for follow-up testing or to arrange for consultations with specialists. You may be referred to a dermatologist, endocrinologist, or gynecologist who can collaborate to develop a coordinated treatment plan tailored to your needs.

Abnormal test results often guide treatment strategies like hormone regulation, lifestyle adjustments, or medications. Your healthcare team will help you understand whether treatments like hormonal therapies, insulin management, or stress reduction techniques can help resolve your acne.

How Test Results Influence Acne Treatment Plans

Test results can uncover hidden causes of difficult-to-treat acne.

Hormonal Therapies

Oral contraceptives, spironolactone, and anti-androgens are common treatments for hormone-related acne. These therapies are tailored to your hormone test results to balance hormones and reduce breakouts.

Insulin and Blood Sugar Management

For those with insulin resistance, controlling blood sugar through diet, exercise, and medication can improve acne. Combining lifestyle changes with medical treatments effectively tackles this root cause and reduces breakouts.

Stress Management and Cortisol Regulation

Mindfulness, stress management, and adaptogens can help lower cortisol-driven acne. In severe cases, low-dose corticosteroids or cortisol blockers may be used to manage cortisol levels and improve skin.

When to Seek Further Testing or a Second Opinion

If acne persists despite treatment, additional testing or evaluations may be needed to explore other causes, like rare conditions or genetics. Consider seeking a second opinion to ensure all underlying factors are addressed.

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Key Takeaways

• Hormonal tests measuring androgens, insulin, and cortisol levels can reveal imbalances contributing to acne, helping clinicians identify underlying causes like PCOS or insulin resistance.

• It's essential to thoroughly discuss your test results with your provider to create a personalized treatment plan, ensuring targeted solutions that address root causes of your acne.

• With proper diagnosis and a targeted treatment plan, hormonally-driven acne can be effectively managed, improving skin health and reducing breakouts.