Retinol Keratin: How Long Do I Really Have to Endure This?

Retinol Keratin: How Long Do I Really Have to Endure This?

Dr. Wi Young-jin from BeautysDoctors here.

💡 Please check this first before reading


Q. When using retinol, do I have to endure the keratin and erythema that develops?

A. No, you don't. Rather than just enduring it unconditionally, we need to determine the right concentration and frequency for your skin condition to see results without unnecessary irritation.


Q. What's the difference between retinol I apply at home and retinol care at a dermatology clinic?

A. The key differences are concentration settings, penetration methods, and whether immediate adjustments can be made for irritation reactions.

"Frequently asked question from Hongdae residents: 'Retinol - how long do I have to endure this?'"

— Dr. Wi Young-jin (Beautystone Clinic, Seoul)

What is Retinol?

Retinol is

a form of Vitamin A that

accelerates skin cell turnover

to improve wrinkles, pigmentation, and pores.

Unlike prescription medications such as tretinoin,

it can be included in cosmetics, but

the effectiveness varies considerably

depending on concentration and formulation.

"How long do I have to endure this?"


— The real reason behind this question

The most frequently asked question

from patients visiting from Hongdae area

is exactly this:

"I started applying retinol

and I'm getting keratin buildup and redness.

Do I originally have to endure this?"

To be honest,

when this question comes up,

it could already be a signal

that something is going wrong.

When retinol enters the skin,

it converts step by step

from retinal → retinoic acid,

accelerating the rate of cell division.

Here's where it gets tricky -

the keratin and erythema that occur

during this process are called

'retinoid reaction.'

Many people misunderstand this part,

but just because this reaction occurs

doesn't mean

"it's working effectively."

It's good when turnover accelerates

within the range your skin barrier can handle,

but if irritation becomes severe enough

to break down the barrier,

it can actually deepen pigmentation

and cause repeated pore inflammation.

But here's something important:

Even with the same 0.5% retinol,

applying it to dry skin versus

oily skin versus

barrier-damaged skin

produces completely different results.

More than half the cases

I see in my practice are like this:

"I applied it daily as I saw on YouTube

and the keratin hasn't stopped for 3 weeks."

When I examine these patients' skin,

they're continuing to use retinol

on already barrier-damaged skin,

believing that enduring it will lead to improvement.

To cut to the conclusion,

when starting with an appropriate concentration,

retinoid reactions usually

stabilize within 2-4 weeks.

If keratin, erythema, and stinging

continue beyond 4 weeks,

it's not a "endurance phase"

but a "stop phase."

Here's how I usually approach it:

I rarely prescribe

high-concentration retinol immediately

to first-time patients.

First, I assess the skin barrier condition,

check the ingredients in products they've been using,

then start with low concentration 2-3 times per week.

After checking progress at 2 weeks,

I decide whether to increase frequency, concentration,

or switch to a different vitamin A derivative.

This approach significantly reduces

the so-called "endurance period."

Most patients adapt within 1-2 weeks.

👨‍⚕️ Dr. Wi Young-jin's Key Summary:


Retinol's effectiveness depends not on "how much you endure"


but on "whether you've accurately set


the concentration and frequency your skin can accept."


If keratin and erythema persist beyond 4 weeks,


it's time to change strategy, not endure.

Home Application vs


Dermatology Clinic Care - What's the Difference?

It varies by case,

but there are definitely people

for whom home care alone is sufficient.

If you have a healthy skin barrier

with good basic moisturizing and sun protection,

low-concentration home care retinol

can adequately maintain skin texture.

But this isn't always ideal.

The limitation of home care is

"difficulty in objectively assessing

your own skin condition."

It usually takes 2-3 weeks

for individuals to recognize

when barrier damage begins.

I frequently see cases in clinic

where skin has already deteriorated significantly

during that time.

Among patients who came to us

after trying multiple retinol products elsewhere,

many achieved skin texture improvement

without keratin after just

accurately setting concentration and frequency,

with 2-3 follow-up observations.

One thing I must mention:

dermatology retinol care

isn't completed in one session either.

Usually, we need 4-6 regular sessions

while gradually increasing concentration

to achieve stable results.

However, it's definitely more efficient

than "enduring alone for months

and only damaging your skin."

Both time and skin recovery costs

are ultimately reduced.

These types of patients come for consultations

Here are the common types

I frequently see in clinic:

First, those who started retinol

based on YouTube/blog content

but have had keratin and erythema

that won't subside for over a month.

Second, those who want retinol benefits

but have sensitive skin

and can't figure out

what concentration to start with.

Third, those who've tried

even tretinoin

but developed pigmentation instead

and are concerned.

For all three types,

the cause was usually

incorrectly setting the "endurance period."

Frequently Asked Questions

Q1. Can I use retinol together with other ingredients?

A. Niacinamide and hyaluronic acid

are usually fine to use together.

However, high-concentration AHA, BHA, and Vitamin C products

can double the irritation

when used on the same day,

so I recommend alternating days.

It depends on your skin condition,

so I'll provide specific guidance during consultation.

Q2. What are the costs and frequency for dermatology retinol care?

A. It varies depending on concentration and combined procedures,

but we usually plan 4-6 sessions

at 2-week intervals

as a basic program.

For costs per session,

I'll provide accurate information

after assessing your skin condition during consultation.

We don't recommend expensive programs from the start,

so feel free to inquire without pressure.

Q3. Can retinol actually make skin worse?

A. Yes, it's possible.

If the concentration is higher than your skin's tolerance,

or if used without sun protection,

pigmentation, dryness, and chronic erythema

can actually worsen.

Especially during summer, many people

use high-concentration retinol

without sun protection,

which is quite dangerous for skin.

Always use SPF 50+ sunscreen

in combination.

Feel free to contact us


via KakaoTalk or phone for any questions.


This was Dr. Wi Young-jin.

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