If neck skin looks darker and feels thicker during GLP-1 treatment, arrange an assessment before choosing another exfoliant.
Notice texture as well as color
The American Academy of Dermatology (AAD) describes acanthosis nigricans as brown or black skin that can feel thicker and velvety. The neck and armpits are common sites. A description cannot diagnose your patch. [1]
If many dark, velvety patches appear suddenly, make an appointment immediately with a dermatologist or primary care doctor. AAD says this can sometimes signal cancer. [3]
An examination can lead to testing
A dermatologist can recognize acanthosis nigricans by examining skin. Blood tests or other investigations may follow to check for conditions such as prediabetes or thyroid disease. Treating an underlying condition may improve the patches, but discoloration can persist. [2]
Discuss the fading product first
AAD advises asking a dermatologist before using bleaching creams, exfoliants or other fading products for acanthosis nigricans. They seldom improve it and irritation can worsen it. Bring your medication list too: medicines can sometimes contribute. Review any proposed medication change with the prescriber. [3]
For cosmetic treatment after assessment, AAD lists prescription creams and other clinician-selected options. These treatments were not specifically developed for acanthosis nigricans, and the condition can be difficult to treat. [2]
These US AAD pages provide general guidance, not GLP-1 trial findings. They do not establish that your injection caused the change or promise that weight loss will clear it. For a separate concern, see our dark-spot care article.
Printed book
How to Keep Your Face on GLP-1
$12.95 + free shipping
Order Now30 day money back guarantee
This article provides general education, not a diagnosis or an individual treatment plan. Medication information refers to US sources. Discuss medication, nutrition and cosmetic treatment decisions with qualified clinicians.
Read next
Skin careAcne Scars During GLP-1: Identify the Mark Before Treatment→Skin careAzelaic Acid for Acne Marks on GLP-1: Trial and Label Checks→Sources
- Acanthosis nigricans: Signs and symptomsAmerican Academy of Dermatology↩ Back to text
- Acanthosis nigricans: Diagnosis and treatmentAmerican Academy of Dermatology↩ Back to text
- Acanthosis nigricans: Tips for managingAmerican Academy of Dermatology↩ Back to text