Acne forms when oil, dead skin, bacteria, and inflammation combine in a pore. This category explains how antibiotics and isotretinoin work differently, and how acne scars are treated and kept from returning.
42 articles
Flat warts are a viral skin condition, so picking or scratching at them doesn't clear them up, it spreads them further. Here's why that happens, how to tell them apart from moles or acne, and the logic behind removal and preventing recurrence.
By Dr. Kim
Ice pick scars are narrow, deep pockmarks that ordinary lasers and fillers struggle to fill in. Here's why TCA CROSS is uniquely suited to this scar type, along with what the treatment and recovery actually involve.
By Dr. Lee
Cystic acne forms when inflammation spreads deep beneath the pore, not just on the surface. Unlike surface pimples, it damages the dermis and often leaves lasting scars. Here's why it grows so deep and hard, and how dermatology treatment brings it back down.
By Dr. Kim
Diet and acne keep coming up together, and two things get singled out most: foods that spike blood sugar fast, and dairy. Here is how the chain from blood sugar to insulin to IGF-1 actually reaches the oil glands and pores, why skim milk gets named more often than whole milk, and what to check first in your own diet.
By Dr. Kim
A lot of people notice more breakouts along the jaw and cheeks the longer they wear a mask. Friction, high humidity, and clogged pores team up to weaken the skin barrier and give inflammation an easy foothold. Here is a look at why this happens and how to manage it, built around the underlying mechanisms.
By Dr. Kim
If you have a yellowish bump on your forehead or cheek that won't go away no matter how much you squeeze it, it might not be acne at all, but sebaceous hyperplasia. Here's an easy breakdown of why enlarged glands form a dimpled bump, how it differs from acne, how electrocautery clears it, and why it tends to come back.
By Dr. Kim
Blackheads aren't trapped dirt. They're a plug of sebum and dead skin cells inside the pore that turns dark through oxidation. Here's why extracting them often leaves marks, and which ingredients actually help, explained through the science behind it.
By Dr. Kim
Enlarged pores and acne scar pores can look like the same small dark dots from a distance, but what's happening underneath the skin is completely different. Here's why each one forms, how to tell them apart, and how the treatment approach differs.
By Dr. Lee
Breakouts that keep returning to the jaw and mouth in adulthood follow a different pattern than teenage acne. Here is a look at how hormones like androgens keep stimulating the oil glands and hair follicles, plus how the menstrual cycle and stress fit into the picture.
By Dr. Kim
Adult acne shows up in different spots than teenage acne, and the causes are different too. Here is how hormones, skin barrier function, and daily habits combine to trigger jawline breakouts, along with the ingredients and habits that actually help.
By Dr. Kim
Some pimples are fine to extract, and others should never be touched. This piece walks through how to tell the two apart and explains, mechanism by mechanism, why inflamed acne often calls for a cortisone injection instead.
By Dr. Lee
Teen acne starts when androgen hormones ramp up oil production, then moves through a few predictable stages that end in clogged pores and inflammation. Here is why this stage of life hits so hard, what actually helps at home, and when it is time to see a dermatologist.
By Dr. Lee
Oral acne medications split into two very different paths: antibiotics and isotretinoin, and they work in completely different ways. Antibiotics go after the bacteria and inflammation driving breakouts, while isotretinoin shrinks the oil glands themselves at the root. Here is a mechanism-focused look at why each gets chosen in different situations.
By Dr. Kim
Sebum output isn't decided by the oil glands alone. Androgens are the hormone that tells the glands how hard to work, and puberty, the menstrual cycle, stress, and blood sugar swings all feed into that same signal. Here is how the hormone-gland relationship explains those sudden oily days.
By Dr. Lee
Acne develops as four factors line up in sequence: excess oil, trapped dead skin cells, bacterial growth, and inflammation. Here's a clear walkthrough of why each stage happens and what's really going on inside a clogged pore.
By Dr. Kim
Whiteheads and blackheads start from the same clogged pore, but whether that plug meets air decides the color. Here's a look at why oxidation turns things black, and what that difference means for how you treat each one.
By Dr. Kim
Milia are the small white bumps that show up around the eyes and just won't budge no matter how you squeeze them. Here's an easy breakdown of how milia actually form, how they differ from acne, and why doctors remove them with a needle or laser instead.
By Dr. Lee
Pores widen when oil and dead skin push out from inside while the elastic tissue around them loses its grip. Here is why a stretched pore rarely bounces back by itself, and what treatment actually targets.
By Dr. Kim
Closed comedones, the small bumps often called whiteheads, form when dead skin cells trap themselves at the pore opening in the earliest stage of acne. Here is why that buildup happens, and how it differs from open comedones.
By Dr. Kim
A clear look at what Acrief is, how trifarotene 0.005% cream differs from Differin, whether it genuinely works on trunk acne as well as the face, what the clinical trials show about timeline and irritation, and how to apply it correctly.
By Dr. Lee
Nodulocystic acne forms deep in the dermis rather than at the pore surface. Here is why the swelling and pain feel so much worse, and how the inflammation spreads to leave lasting scars.
By Dr. Lee
How fractional lasers like Fraxel work on acne scars, why results differ so much by scar type, how real the PIH risk is on Asian skin, and what the research actually shows about how much improvement to expect: scars soften, they don't vanish.
By Dr. Kim
What TCA CROSS is, why it outperforms laser on narrow deep icepick scars, how concentration affects outcomes, how proper prep slashes post-inflammatory hyperpigmentation risk, and how to combine it with other treatments, all backed by clinical study numbers.
By Dr. Lee
Air subcision uses compressed air to push a cannula through skin and release the fibrous bands tethered beneath a scar. Needle subcision aims for the same goal by hand, but the way force is delivered, and how it feels against the tissue, is different. Here is how the two methods actually compare, principle by principle.
By Dr. Kim
A clear-eyed look at NeoBeam's 1450nm diode laser technology, how well it controls active breakouts and excess oil, why it's limited for acne scars, and what the class-level clinical data really shows.
By Dr. Kim
What subcision actually involves, which acne scars it suits and which it doesn't, how results change when you add filler or laser, what bruising and downtime to expect, and who the right candidate is, explained with real study numbers and no inflating.
By Dr. Lee
A clear-eyed look at what Differin gel is, where adapalene sits in the retinoid family, and how it works at the follicle level, backed by clinical trial data, not marketing copy. Covers the purging phase, realistic timelines, the tretinoin and Aklief comparisons, and when topical adapalene isn't enough.
By Dr. Lee
If a lump under your skin keeps refilling no matter how many times you squeeze it like a pimple, it may be an epidermal cyst. Here's an easy breakdown of how these cysts form, how they differ from acne, and why the cyst wall itself has to come out to keep it from coming back.
By Dr. Lee
Acne scars fall into three shapes, ice pick, boxcar, and rolling, each formed by a different process under the skin. Here's an easy breakdown of why they differ and why treatments like TCA CROSS and subcision suit specific scar types.
By Dr. Lee
How photodynamic therapy (PDT) combines ALA and MAL photosensitizers with blue, red, and IPL light sources to calm inflammatory acne, how Gold PTT and the platinum angle method differ, and the reduction rates, relapse rates, and downtime confirmed in actual studies.
By Dr. Kim
Potenza needle RF uses fine needles to bypass the skin surface and deliver heat directly into the dermis. Here is a plain walk through why that heat improves scars and pores, how many sessions it usually takes, and what the downtime looks like.
By Dr. Lee
The questions patients ask most during acne treatment, gathered in one place. Why treatment takes so long, the difference between topical and oral medication, the role of isotretinoin, why you shouldn't pop pimples, birth control and antibiotics, when scar treatment should start, and why breakouts come back.
By Dr. Lee
Those tiny bumps under the eyes are easy to mistake for milia, but syringoma actually forms through a completely different process. Here's how these growths develop from sweat gland tissue, why removal is so tricky, and why they tend to come back.
By Dr. Lee
A clear, research-backed guide to why red marks (PIE) appear after acne heals, how they differ from brown pigmentation (PIH) and pitted scars, how long they take to fade naturally, how vascular lasers like Vbeam and Excel V speed up the process, how to manage them at home with sunscreen and calming care, and why treating them early matters before they turn into scars.
By Dr. Kim
TCA CROSS places high-concentration acid precisely at the base of narrow, deep ice pick scars to trigger fresh collagen growth right where it's needed. Here's why this method works so well for narrow scars, how the scar gradually fills in, and why it takes multiple sessions to see results.
By Dr. Kim
Chest acne doesn't quite follow the same rules as facial acne. Sweat, friction, and a blocked follicle environment play a bigger role, and a fungus called Malassezia can cause a folliculitis that looks like acne but isn't. Here's what's really going on and what helps.
By Dr. Lee
Back acne starts from the same root as facial acne, but thicker skin, denser oil glands, sweat, and friction change how it grows. Here is why the back breaks out so easily and why treatment takes longer to work, along with how to manage it.
By Dr. Kim
Skin tags tend to crop up again and again in spots where skin rubs constantly against clothing, like the neck and underarms. We break down the two real causes, friction and aging, show how to tell them apart from moles, and explain how laser and electrocautery removal work along with the aftercare that helps keep them from coming back.
By Dr. Lee
Why acne on the back and chest behaves differently than facial acne, how to tell true acne apart from fungal folliculitis, and what the research actually shows about benzoyl peroxide washes, topical retinoids, oral isotretinoin, peels, and laser treatments.
By Dr. Lee
Subcision is a procedure that uses a needle to cut the fibrous tissue under the skin that is pulling a scar downward. Here is why scars sink in, how the needle releases that pull, and why treatment usually takes 3 to 6 sessions.
By Dr. Lee
Men's acne often lingers well past the teenage years and tends to spread across wide areas like the back and chest. Here is a look at what sets men's acne apart, from how testosterone stimulates the oil glands to shaving, muscle supplements, and delayed treatment.
By Dr. Kim
How isotretinoin (Roaccutane/Accutane) clears severe acne at the root by shrinking the sebaceous gland, why cumulative dose and treatment duration matter, how common cheilitis and skin dryness are, why pregnancy is absolutely contraindicated, and what large-scale data shows about depression and suicide risk, all without exaggeration.
By Dr. Kim