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This kind of black scars are being formed on my neck no irritated no allergy
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American Academy Dermatology acanthosis nigricans neck insulin resistance evaluation
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The photo is not clear enough to diagnose, but this does not look like a typical scar. It appears more like mild darkening in a neck fold. One possibility is acanthosis nigricans, which causes darker, sometimes thicker or velvety skin on the neck and can occur without itch or allergy. It is often associated with insulin resistance, weight gain, prediabetes, PCOS, or sometimes friction. Fitzpatrick's Dermatology, p. 2524 describes it as symmetric brown to gray-black thickening, commonly affecting the back and sides of the neck.
Please arrange a routine visit with a doctor or dermatologist. Ask whether you should have:
- Blood sugar testing: fasting glucose and/or HbA1c
- Blood pressure, weight, and cholesterol assessment
- PCOS/hormonal assessment if you have irregular periods, acne, or excess facial/body hair
The AAD guidance notes that dark velvety neck patches may signal prediabetes or another underlying condition, and treating the cause often improves the skin.
Until then:
- Avoid rubbing, scrubbing, lemon, bleaching creams, and unprescribed steroid creams.
- Avoid tight collars, necklaces, or friction in that area.
- Use a gentle cleanser and plain moisturizer.
Seek earlier medical review if the dark area is spreading quickly, becomes very thick, painful, itchy, develops sores, affects the mouth, or you have unexplained weight loss. Rapid new widespread changes need assessment, although that is uncommon.
How to treat it
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"acanthosis nigricans" AND treatment
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acanthosis nigricans treatment dermatologist underlying cause American Academy Dermatology
Treatment depends on the cause. If this is acanthosis nigricans or friction-related darkening, it usually improves gradually after treating the underlying trigger. It is not something that can safely be scrubbed off.
What you can do now
- Do not scrub, bleach, use lemon, or use fairness/steroid combination creams. These can irritate the neck and make pigmentation worse.
- Wash gently once daily and use a simple fragrance-free moisturizer.
- Reduce friction: avoid tight collars, rough chains, and repeated rubbing.
- If overweight, gradual weight reduction, regular exercise, and reducing sugary drinks/refined carbohydrates can improve insulin resistance and may help the neck skin fade over months.
Medical treatment
Please see a dermatologist or general physician before starting medicated creams. They may:
- Check fasting blood glucose or HbA1c, blood pressure, weight, and sometimes thyroid tests. If you have irregular periods, acne, or increased facial hair, ask about PCOS evaluation.
- Treat any identified cause, such as prediabetes, diabetes, PCOS, thyroid problems, or a medication trigger. This is the main treatment.
- If appropriate, prescribe a treatment to smooth/lighten the area, such as a retinoid cream or keratolytic/moisturizing treatment. These can irritate the neck if used incorrectly, and retinoid creams should not be used during pregnancy unless specifically prescribed.
Dermatology texts report that creams such as urea, salicylic acid, glycolic acid, and retinoids have been used, but results are variable and managing insulin resistance or another cause is more important. Fitzpatrick's Dermatology, p. 2524. The AAD treatment guidance similarly advises checking for an underlying condition and notes that prescription topical treatments may help appearance.
Do not buy strong peeling solutions or laser treatments without a dermatologist. They can cause burns and darker marks, especially on neck skin.
Please seek review sooner if it appeared suddenly, is spreading quickly, becomes very thick, or you have unexplained weight loss. Recent reviews also confirm that topical-treatment evidence is limited and variable, so be cautious about promises of a fast cure (PMIDs: 41140645, 38904687).
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