This episode explores dermatological pharmacology as the science of boundary management. The skin is both shield and signal-exposed to the environment yet deeply connected to immune, endocrine, and neural systems. We examine barrier structure, keratinocyte turnover, inflammation, infection, and pigmentation to understand why topical therapy is as much about where and how a drug is delivered as what it is. The clinical emphasis is proportion: matching potency, vehicle, and duration to disease without eroding the barrier you are trying to heal.

Key takeaways to anchor practice:

* Barrier biology: stratum corneum as gatekeeper, not passive coating.

* Vehicle matters: ointment, cream, gel, lotion-and why choice changes effect.

* Anti-inflammatory strategy: topical corticosteroids, calcineurin inhibitors, and risk gradients.

* Infective and proliferative disease: acne, psoriasis, fungal and bacterial patterns.

* Long-term thinking: tachyphylaxis, skin atrophy, adherence, and education.

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