Skin conditions — K-Beauty Library
All 26 skin conditions guides.
Acne mechanica: when the cause is a strap, a helmet or a maskAngular cheilitis: sore splits at the corners of the mouth, and why lip balm is not the answerAtopic dermatitis (eczema): where gentle skincare helps, and where it stopsBumps after hair removal: folliculitis, ingrown hairs, and when it is more than irritationBurning or stabbing pain in one band of skin: this is a same-day medical matterChronic hand eczema: wet work, soap and a barrier that never gets a breakContact dermatitis: telling plain irritation apart from a true allergyCystic and nodular acne: deep painful lesions that need medical careEyelid dermatitis: the thinnest skin on your face, reacting to somethingHeat rash: what 땀띠 actually is, and why cooling beats creamsHormonal acne: a useful shorthand and an imprecise labelKeratosis pilaris: harmless, stubborn, and nothing to do with hygieneMalassezia folliculitis: not acne, and the internet's ingredient lists overreachMilia: firm keratin cysts under the surface, and why squeezing achieves nothingPCOS and the skin: why the acne page is not the whole picturePerioral dermatitis: the rash around the mouth that more products make worsePost-inflammatory hyperpigmentation, erythema and melasma are three different problemsPsoriasis: an immune condition where moisturiser is comfort, not treatmentRosacea: what the term covers, and how calming skincare fits around treatmentSeborrhoeic dermatitis: the flaky redness people keep treating as drynessSteroid-damaged skin: a real phenomenon, a contested label, and one firm ruleSun allergy: what PMLE is, and why it appears on the first bright daysThe skin changes worth stopping everything forUrticaria: itchy wheals that move around, and the version that is an emergencyVitiligo: what it is, why sun protection matters most, and what skincare cannot doWhere the skincare aisle ends and medicine begins
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✍️ Written & reviewed by the KoreaPlus Editorial team — dermatologist-informed, cosmetic-science researched & source-cited. Last reviewed: 2026-08-10.
General educational information using cosmetic structure-function wording — not medical advice. Always patch-test new actives. © KoreaPlus.