The Real Reason Seborrheic Keratoses Keep Coming Back — And Why Nobody Told You This Before

The morning I started asking the wrong question

I started investigating this after I received an email from a reader.

She’d been managing seborrheic keratoses — the flat, cornflake-ish or harder warty growths that cluster on the trunk, chest, neck and back — for eleven years. In that time she’d had hundreds removed. Paid for cryotherapy sessions at $250 a group. Tried IPL. Tried wart remover at home, medical freeze spray from Amazon, ACV on a cotton pad held in place with a bandaid.

“More arriving every day,” she wrote. “I’ve been told it’s just the nature of them. I want to understand if that’s actually true, or if there’s something I’m missing.”

It’s a question I’d heard variations of before. This time I decided to actually answer it. What I found surprised me — not because the answer was complicated, but because it was simple, specific, and apparently nobody had told these women.

Why most treatments fail, and what that actually means

To understand why seborrheic keratoses keep returning, you first need to understand what they actually are.

They’re not a pigmentation issue. They’re not surface discolouration. They’re not something that can be managed the same way as a dark spot or a patch of dry skin.

Seborrheic keratoses are physical growths — abnormal keratin buildup, the same protein that forms the outer layer of skin, accumulating and hardening into raised growths faster than the skin can shed it. That’s what creates the flat cornflake-ish ones and the harder warty ones. They’re not sitting on top of the skin. They are the skin, hardened into something the skin’s natural shedding process can’t keep up with.

Why cryotherapy and cauterisation keep failing

Professional removal destroys the growth at the cellular level. What it doesn’t do is address the skin’s underlying tendency to keep producing new ones. Which is why they come back. And why new ones appear alongside the ones just removed. The session solves the visible problem while leaving the cause completely untouched.

Why creams and most topicals do almost nothing

Applied to the surface of a hardened keratin growth, most products are absorbed or wiped away before they can dissolve anything meaningful. A cream that sits on top of that layer for sixty seconds — before being absorbed into the skin around it or rubbed off by clothing — can’t penetrate it. Contact time is the missing piece, and most topical applications have almost none.

Why IPL helps more than most but still can’t keep pace

It penetrates deeper than a topical, which is why it produces more visible results. But at several hundred dollars per session, several sessions per year, it was never going to keep up with a condition that keeps multiplying between appointments regardless of how thorough each session is.

The mechanism failure is the same across all three: they address the individual growth after it’s formed. None of them address the keratin overproduction that keeps forming new ones continuously.

Five women, almost identical answers

When I asked five women who’ve been managing this condition for years to describe their experience with treatment, the accounts overlapped almost word for word.

Margaret, 62 — Florida

“I noticed the first ones on my back maybe six years ago. One. I wasn’t worried. Then there were five. Then ten. Then I stopped counting. I’ve been getting groups cauterised off every winter. Hundreds of dollars per area. I sit through the sessions, wait for the white marks to fade, feel relieved for a few weeks. Then I look down and find more than I started with.”

Linda, 55 — Ohio

“I can look at my left side alone and count close to a hundred. My back must have several hundred more. They start small and flesh-coloured — easy to dismiss. Then they darken, get raised, and spread to places the previous ones never reached. Every time I shower and catch a glimpse in the mirror, there are more.”

Patricia, 58 — Texas

“I’d had them removed. Hundreds removed. And hundreds still there. Every session felt like progress. Then I’d look down and realise I’d spent hundreds of dollars to temporarily remove things that were just going to come back while new ones arrived in the meantime. I’d traded one visible problem for white marks. And now I was being told that was the best available answer.”

Carol, 61 — Georgia

“I just wanted to get ahead of all of them at once. Not spot treat one or two and watch ten more appear while I was dealing with those. I read every thread. Saw every suggestion. Dermaplaning. Chemical peels. IPL. Creams that claimed to help. My skin got drier. More sensitive. The hundreds on my back, sides and trunk looked exactly the same. I was always behind.”

Susan, 64 — Virginia

“The thing nobody prepares you for isn’t the appearance of the first one. It’s the feeling that once they start, nothing stops them. Like your skin has switched something on that you can’t switch back off. Doctors say, ‘Wow, you do have a lot. Did you spend a lot of time in the sun?’ I have hundreds on areas that have never seen the sun in my life.”

What strikes me across all five accounts isn’t the frustration — though that’s palpable. It’s the resignation. Every one of these women has done the sensible things. They’ve been to dermatologists. They’ve researched and experimented and spent money and been consistent. And every one of them has arrived at the same conclusion their doctor gave them.

It’s just the nature of them.

I wanted to know if that conclusion was actually the end of the story — or just the end of what professional removal could offer.

The question that changes everything

The reason “it’s just the nature of them” feels so final is because it’s answering the wrong question.

The question these women have been asking — and the question cryotherapy, IPL and home removal methods have been answering — is: how do I remove what’s already here?

That’s not the question that matters. The question that matters is: why does the skin keep producing them faster than anything can remove them, and what actually addresses that process directly?

The answer comes down to two things nobody mentions in the standard dermatologist conversation.

The keratin structure of each individual growth

Every seborrheic keratosis is a hardened keratin formation. Not a bump with soft tissue underneath. A physically hardened structure. Which means anything designed to work on skin — a cream, a serum, a topical pad — is sitting on top of a hardened surface it can’t penetrate without sustained, direct contact. Treating something hard requires something that stays against it long enough to break it down.

Contact time

This is the piece that almost nobody in the skincare conversation names explicitly. Contact time is the amount of time an active ingredient spends in direct contact with what it’s supposed to be working on. A cream applied to a hardened growth and then absorbed into surrounding skin in sixty seconds has had almost no contact with the growth itself. A product applied and immediately rinsed away — a wash, a toner on a pad — has even less.

Glycolic acid dissolves keratin bonds. Salicylic acid penetrates through keratin structures. Both of these are well-established. But they need time to work — and most formats they come in don’t provide it.

It’s not the wrong chemistry. It’s the wrong delivery.

The discovery

After months of the same conversations — dermatologist visits, home experiments, forum posts ending in “it’s just the nature of them” — each of the five women I spoke to eventually found their way to the same product through different routes.

A friend noticed one morning at a book club. A neighbour mentioned it getting into a dress. A sister-in-law who worked in a dermatology practice suggested looking at leave-on acid formats specifically. A forum post at 11PM that finally explained the contact time mechanism.

What they all arrived at was the Celasti Glycolic Body Stick.

The formulation

Celasti Glycolic Body Stick

• 7% glycolic acid — at this concentration, glycolic acid dissolves the keratin bonds holding the hardened skin cells of a seborrheic keratosis together. It’s working on the structure of the growth itself, not the skin around it.
• 0.5% salicylic acid — oil-soluble, so it penetrates through the growth and addresses the keratin buildup underneath. One acid dissolving from the outside. One working through from within.
• 10% shea butter — for skin that has been through repeated removal attempts and is sensitised and reactive, something actively rebuilding the barrier while the acids work isn’t optional.

Get the Celasti stick

The format is a leave-on stick. One swipe across the affected area. Left on the skin — not rinsed, not wiped away. That’s the contact time piece.

“The reason I kept dismissing topicals was because nothing ever stayed on long enough to do anything. A serum disappears in minutes. A wash is gone immediately. This stays.”

Carol, 61

What actually happens

None of the five women I spoke to described overnight transformation. What they described was more specific, more honest, and — I’d argue — more persuasive than any dramatic before-and-after story.

Margaret: “Day five, I ran my finger over the flatter ones on my chest. Different. Less raised. Day seven, I compared one to a photo I’d taken two weeks earlier. The flatter ones had visibly reduced. Not gone. But different in a way nothing had managed before. Week three, I wore a lower cut top. I didn’t think about it until I was already out the door.”

Linda: “Day ten, I caught myself not doing the morning check automatically. First time in as long as I could remember. The harder warty ones on my neck were still there at two weeks but the edges had softened. And the new ones appearing — smaller than the ones I’d been dealing with for years. Flatter from the start. That was new.”

Patricia: “Two months in, new ones still arrive. But they don’t get the chance to build up the way they used to. I catch them earlier. Keep them flatter. For the first time I feel like I’m actually keeping pace with them.”

Carol: “The flat ones are basically gone. The harder ones are flatter. I haven’t booked a dermatologist appointment in four months. That’s the part that surprised me most.”

Susan: “Someone close to me noticed the ones on my chest had changed before I told them anything. They’d seen my skin for years. That was when I knew something had actually shifted.”

The honest answer to “it’s just the nature of them”

That four-word sentence is true, to a point. New seborrheic keratoses will always appear. The skin’s tendency to overproduce keratin in certain patterns doesn’t have an off switch. No topical product — this one included — changes that underlying biology.

What the sentence leaves out is this: the rate at which new ones build up and become visible, the size and height of existing ones, and the consistency with which they’re addressed are all things that can change. And they’re the things that actually determine what you see in the mirror.

Which leaves two options

Every one of these women had already tried the first option for years before they found the second. Not one of them describes it as a cure. All five of them describe it as the first time they stopped losing ground.