If the main change is dark, thickened skin rather than individual growths, another possibility is a condition called acanthosis nigricans.
It commonly affects the armpits, neck, and groin. The skin may become darker, thicker, and velvety.
This condition can be associated with insulin resistance, obesity, and type 2 diabetes. Occasionally, it has other causes.
If you notice new or progressive darkening and thickening of the skin, arrange a medical appointment. A clinician may recommend checking blood glucose or other tests based on your symptoms and medical history.
4. Other Skin Conditions
Not every cluster of armpit bumps is caused by skin tags or warts.
Other possibilities include folliculitis, which involves inflammation of hair follicles, and hidradenitis suppurativa, a chronic condition that can cause painful lumps, abscesses, and tunnels beneath the skin.
Painful, red, warm, or pus-filled bumps should be evaluated, particularly if they recur.
A sudden change in the appearance of a growth, persistent bleeding, an open sore, or a rapidly enlarging lump also deserves medical attention.
What Causes Skin Tags to Develop?
Skin tags are common, and several factors may contribute to their development:
Skin friction: Repeated rubbing between skin surfaces or against clothing can contribute to skin tag formation.
Age: Skin tags become more common as people get older.
Genetics: Some people are more likely to develop them because of family history.
Metabolic factors: Multiple skin tags may occur alongside obesity, insulin resistance, or type 2 diabetes. Their presence does not, by itself, mean someone has diabetes.
If you develop numerous new skin tags, particularly alongside other risk factors for diabetes, ask your healthcare professional whether blood glucose screening would be appropriate.
How Are These Growths Treated?
Treatment depends on the diagnosis.
If a clinician confirms that the growths are harmless skin tags, possible removal methods include:
- Cryotherapy: Freezing the growth with a medical treatment.
- Electrosurgery: Using controlled electrical energy to remove the growth.
- Sterile snip excision: Removing the growth with an appropriate medical instrument.
These procedures should be performed by a qualified professional when appropriate. Some growths may not need treatment at all.
Do not apply wart-removal acids, household chemicals, or unverified natural remedies to the sensitive skin under your arms. Such products can cause burns and permanent scarring.
When Should You See a Doctor?
Arrange a medical examination if the growths are new, increasing in number, changing in appearance, or difficult to identify.
Seek prompt medical attention if you notice rapid enlargement, persistent bleeding, significant pain, spreading redness, fever, or drainage of pus.
Most skin tags are benign, but a photograph cannot reliably distinguish every possible cause. A physical examination is the safest way to establish the diagnosis.
Final Thoughts
Clusters of small growths under the armpit can have several explanations, including skin tags and viral warts. Darkened, thickened skin may have a different cause, such as acanthosis nigricans.
The key is to avoid self-diagnosis and potentially harmful home treatments. If the growths are multiplying or changing, a healthcare professional can identify the condition and recommend appropriate care.
Remember: Skin tags alone do not prove that you have diabetes or cancer. The appearance, progression, and associated symptoms determine whether further evaluation is needed.
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