Skin tags form where skin experiences repeated friction, and friction is the correct explanation for the vast majority of skin tags that appear in adults. The mechanism is simple: low-level mechanical irritation, sustained over months or years in the same spot, triggers the growth of soft fibrous tissue outward through a narrow stalk. The locations where skin tags cluster most densely are exactly the locations where friction is highest: the neck under a collar, the armpits where the arm moves against the body all day, the groin and inner thighs where legs rub together while walking, and under the breasts where the bra band creates a daily contact line.
For the full picture on skin tags, see our complete skin tags guide. This page covers the friction mechanism specifically.
Key takeaways
Friction is the primary driver. The location of your tags tells you the source.
- Skin tags form at friction points: wherever skin rubs against skin or against fabric repeatedly over time.
- The high-friction anatomy (neck, armpits, groin, under breasts, eyelids) is where tag clusters appear most predictably.
- Clothing and jewelry are friction sources, not just skin-on-skin contact. A tag directly under a necklace or at a waistband line is explained by that contact.
- Reducing friction can slow new tag formation but does not remove existing tags.
- The plasma pen removes the existing tags at the stalk base, regardless of the original friction source.
Why friction causes skin tags
The skin-tag formation mechanism starts with repeated mechanical stimulation of the dermis at a specific point. When the outer skin layer (epidermis) and the connective tissue beneath it (dermis) experience low-level chronic friction, the body responds by proliferating fibroblasts, the cells that produce collagen and connective tissue. That proliferation grows outward through the epidermis as a small stalk of fibrous tissue with a blood supply, which is what a skin tag is at the structural level.
The process is slow and painless, which is why most people notice a cluster of several skin tags at once rather than watching a single tag develop. A tag that is visible today has been forming for months. Multiple tags in the same zone often represent the cumulative response to friction over years of the same clothing pattern, body mechanics, or weight distribution.
According to NIH MedlinePlus, skin tags (acrochordons) are soft, benign fibrous growths that develop at friction sites. The Wikipedia entry on acrochordons describes them as common in adults and associated with obesity, age, and friction.
Why some people are more susceptible
Friction is the trigger, but the inflammatory and fibroblastic response to that friction varies between people. Two factors significantly amplify how much skin-tag growth results from the same friction exposure.
Insulin resistance
Elevated circulating insulin promotes growth factor activity in skin cells, making the friction-triggered fibroblast proliferation response larger. People with insulin resistance, or with prediabetes and type 2 diabetes, develop skin tags at a notably higher rate than people with normal insulin sensitivity exposed to the same friction. This is why skin tags are sometimes used as a soft clinical signal for insulin resistance. See our diabetes and skin tags guide for the full clinical picture.
Body weight
Higher body weight creates more friction zones: more skin folds where skin rests against skin, tighter clothing contact at waistbands, more underarm and inner-thigh surface contact during walking. It also correlates with higher insulin resistance rates. The result is both more friction exposure and a higher cellular response per friction event. See our skin tags and weight loss guide for how the weight-tag connection works in practice.
Hormonal shifts
Estrogen and progesterone fluctuations, most prominent in pregnancy and perimenopause, affect the skin's fibroblast response to irritation. Skin tags formed during pregnancy often multiply rapidly; skin tags in perimenopausal women often appear in clusters for the first time. The hormonal factor amplifies the friction response, it does not create tags where there is no friction. See our skin tags and pregnancy guide for the hormonal connection in detail.
Friction starts the process. Insulin resistance and hormonal shifts decide how large the response is. The same waistband that produces one tag in a person with normal insulin sensitivity may produce five in a person with insulin resistance.
The friction-zone map
Skin tags cluster at the highest-friction anatomy. The following table shows where friction is highest, why, and what the typical tag pattern looks like.
If you look at where your skin tags are and map them against this table, the friction source is usually immediately visible. A cluster on the back at exactly the bra band level; a cluster at the inner thigh where your trousers are tightest; a single tag at the exact spot where your necklace rests all day. The location tells you the cause.
Can you prevent skin tags by reducing friction?
Yes, to a meaningful degree, but with an important limit: friction reduction prevents new tags. It does not remove existing ones.
Friction prevention strategies that actually work:
- Change how your clothing sits. A different necklace length, a softer collar style, loose-fitting athletic wear in the inner-thigh zone: these reduce the primary friction contact that drives tag formation in those spots.
- Use anti-chafe products in high-friction zones. Body glide or anti-chafe balms reduce skin-on-skin friction in the inner thighs and underarms. They do not replace tag removal but do reduce new formation rates.
- Address the underlying metabolic factors. If insulin resistance is amplifying your friction response, improving insulin sensitivity through diet, exercise, or medical management reduces how many tags form per friction event. See our skin tags and weight loss guide for the metabolic connection.
What friction reduction cannot do: shrink or remove tags that have already formed. Existing skin tags are stable fibrous tissue with their own blood supply. They do not reverse when the friction stops.
What removes the tags that are already there
The existing tags need to be addressed separately from the friction-prevention work. The OcuraLife Plasma Pen treats the stalk base with controlled plasma energy, causing the tag tissue to dehydrate and form a small scab. The scab falls off on its own between Day 3 and Day 7. The underlying skin renews over Week 2 to Week 3. Nine adjustable settings let you calibrate the energy to the tag size.
You can address friction prevention and existing-tag removal in parallel: use anti-chafe strategies and clothing changes going forward, and treat the existing cluster with the plasma pen. The combination stops new formation and clears what is already there. For the full at-home treatment walkthrough, see our how to remove skin tags at home guide.
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The bottom line
Friction is the primary cause of skin tags, and the location of your tags tells you the friction source. Reducing friction prevents new tags from forming but does not address the existing ones. The OcuraLife Plasma Pen treats the stalk base in about five minutes per tag, with a scab that falls off by Day 3 to Day 7 and clear skin by Week 2 to Week 3. Friction prevention and plasma pen treatment work well together: prevent what you can going forward, and clear what is already there in one session. According to NIH MedlinePlus, skin tags are common benign findings in adults and are safely treated with removal when desired.
Related guides in this series
- Skin Tags: The Complete Guide
- Skin Tags on the Neck
- Skin Tags by Location and Cause
- Skin Tags and Weight Loss
- Diabetes and Skin Tags
- How to Remove Skin Tags at Home
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Clear the existing tags at home
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Treats the stalk base in about five minutes per tag. A scab forms, falls off on its own by Day 3 to Day 7, and skin clears by Week 2 to Week 3. Works on tags of any size in any friction zone.
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