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Living with Insulin-resistant diabetes mellitus AND acanthosis nigricans

A rare condition (type A insulin resistance syndrome) with severe insulin resistance that leads to diabetes and other changes.

Understanding Insulin-resistant diabetes mellitus AND acanthosis nigricans

Insulin-resistant diabetes mellitus and acanthosis nigricans, also called type A insulin resistance syndrome, is a rare disorder with severe insulin resistance.

The body's tissues don't respond properly to insulin, which affects blood sugar control and leads to diabetes. In females, major features usually show in adolescence. It can begin from childhood to adulthood.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Diabetes (high blood sugar)
  • Delayed puberty
  • Excess body hair (hirsutism)
  • Darkened skin
  • Thickened skin (hyperkeratosis)
  • Firm lumps under the skin

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include genetic specialists, hormone specialists, maternal-fetal medicine specialists and women’s reproductive health specialists.

  3. Consider genetic testing

    Changes in INSR are linked to this condition. Genetic testing and counseling can help confirm a diagnosis and explain what it means for your family.

  4. Connect with expert centers

    Resolve: The National Infertility Association may keep lists of experts for this condition.

Care & treatment

Care team
Genetic specialists (geneticists); Hormone specialists (endocrinologists); Maternal-fetal medicine specialists (pregnancy-related); Women’s reproductive health specialists (obstetricians / gynecologists)
Expert care
Expert lists: Resolve: The National Infertility Association
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with Resolve: The National Infertility Association
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
Can genetic testing for the INSR gene confirm the diagnosis?
How is my blood sugar managed?
Which specialist should follow puberty and hormones?

Quick facts

Symptoms usually startfrom Childhood to Adulthood
InheritanceAutosomal Dominant, Autosomal Recessive
GenesINSR

Changes in the INSR gene cause this condition. It can be inherited in an autosomal dominant or an autosomal recessive pattern.

GeneticEndocrine

Also known as: diabetes mellitus, insulin-resistant, with acanthosis nigricans; diabetes mellitus, insulin-resistant, with acanthosis nigricans, type a; hereditary benign acanthosis nigricans with insulin resistance; insulin receptor defect with insulin-resistant diabetes mellitus and acanthosis nigricans; insulin receptor, defect in, with insulin-resistant diabetes mellitus and acanthosis nigricans; insulin resistant diabetes mellitus with acanthosis nigricans and hyperandrogenism

Patient organizations

Broader rare-disease groups

Source: NIH GARD · Insulin-resistant diabetes mellitus AND acanthosis nigricansGARD ID 3008 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Insulin-resistant diabetes mellitus AND acanthosis nigricans.

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