Pharmacology for Nurses · Dermatologic Disorder Drugs
Other Dermatologic Condition Drugs and Topical Anti-infectives for Burns
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In 30 seconds
The dermatology formulary does not end with acne and psoriasis. This topic covers the drugs used for other common skin conditions — eczema (Atopic dermatitis The medical name for eczema — a chronic itchy, inflammatory skin disease Full entry →), fungal infections, viral skin infections, and infestations such as scabies and lice — and then turns to a different world entirely: topical anti-infectives for burns. Burn care is included here because a burn is the most extreme form of skin-barrier loss. When the stratum corneum — the protective wall described in the first topic of this chapter — is destroyed, infection is no longer a possibility but the central threat, and topical anti-infectives become life-saving tools rather than cosmetic adjuncts.
Two organizing ideas tie this topic together: most dermatologic drugs restore the barrier, calm the immune response, or remove the offending organism (antifungals, antivirals, antiparasitics, burn anti-infectives), and the nurse's assessment of the skin drives everything that follows.
Why this matters
- Everyday prevalence: Eczema, fungal infections, and infestations are among the most common conditions seen in primary care, schools, and long-term care — and scabies and lice spread readily in group settings, where nurses often lead detection and control efforts.
- Infection is the leading threat in burn recovery: Once the skin barrier is lost, bacteria invade easily, and sepsis is a major cause of burn-related death.
- Antimicrobial stewardship applies to skin too: Overuse of topical antifungals and antibiotics drives resistance; knowing which agent matches which organism supports appropriate use.
- Teaching is the treatment: Eczema regimens, complete courses of antifungal therapy, and family-wide treatment for infestations all depend on patient and caregiver education.
- Scope and teamwork: Burn care is delivered by interdisciplinary teams; the nurse's role is assessment, application, monitoring, and documentation, within scope and institutional protocol.
The college version
Core Concepts
Eczema (atopic dermatitis): barrier repair plus inflammation control
Atopic dermatitis is a chronic inflammatory skin disease driven by a defective skin barrier and an overactive immune response, with intense itching as its hallmark. Treatment has three tiers:
- Emollients (moisturizers) are the foundation — they restore the barrier and reduce water loss, decreasing itch and flare frequency. They are the "always" part of the regimen.
- Topical corticosteroids calm the inflammation during flares; as with psoriasis, potency is matched to site and severity.
- Topical calcineurin inhibitors (tacrolimus, pimecrolimus) are non-steroid alternatives that block T-cell activation — useful for sensitive sites like the face where prolonged steroid use is undesirable. They are not steroids, which matters for teaching: they may cause burning or warmth when applied but do not cause steroid-related skin thinning.
Nursing education centers on the soak-and-smear rhythm: gentle bathing, immediate moisturizing, medication applied to affected areas, and consistent daily care even when skin looks clear.
Fungal skin infections: dermatophytes and the drugs that stop them
Fungal skin infections (ringworm, athlete's foot, jock itch, and yeast infections) are caused by dermatophytes and other fungi that live on keratin in skin, hair, and nails. The two main drug classes:
- Azoles (e.g., clotrimazole, miconazole, ketoconazole) block the synthesis of Ergosterol The fat that fungal cell membranes need to stay intact Full entry →, a fat the fungal cell membrane needs — without it, the fungus cannot maintain its membrane and dies. Azoles are broad-spectrum and are also used for seborrheic dermatitis (dandruff-type scaling driven by the yeast Malassezia).
- Allylamines (e.g., terbinafine) inhibit a different enzyme earlier in the same ergosterol pathway — especially effective against dermatophytes, including nail infections, where oral therapy is often needed.
The nursing essentials: complete the full course even when the rash looks better (fungus is persistent), keep skin dry (fungi thrive in moisture), and treat nail infections patiently — they resolve over months as new nail grows.
Viral skin infections and infestations
- Herpes viruses (cold sores, genital herpes) are treated with antivirals such as acyclovir, a nucleoside analog the virus mistakenly incorporates into its DNA, halting replication. Topical products treat cold sores; systemic antivirals are used for more severe or recurrent disease.
- Scabies (the mite Sarcoptes scabiei burrowing in skin) and head lice are treated with scabicides/pediculicides, most commonly Permethrin A topical agent that paralyzes and kills mites and lice Full entry →, a neurotoxin that paralyzes and kills the arthropods without harming the person at typical topical use. Scabies requires treating the whole body and close contacts, and lice require combing and laundering — control depends as much on hygiene measures as on the drug.
Burns: when the barrier is gone
A burn destroys the skin's barrier, and the resulting wound is a perfect culture medium: warm, moist, protein-rich, and colonized by the person's own skin flora. Infection of the burn wound is the dominant threat, and topical anti-infectives keep bacterial counts low. The classic agents:
- Silver sulfadiazine releases silver ions, which are broadly antimicrobial by damaging bacterial cell components. It is a mainstay cream for many burn wounds, soothing and easy to apply.
- Mafenide acetate is a sulfonamide-type Anti-infective An agent that kills or suppresses microorganisms (broader than "antibiotic") Full entry → notable for penetrating burn Eschar The dead tissue crust that forms on a deep burn wound Full entry → (the dead tissue crust) deeply — valuable when infection may lie beneath the surface. It stings on application and can affect acid–base balance, which is why its use is reserved and monitored.
- Silver nitrate solution is an older silver-based option, applied as wet dressings; it is inexpensive but stains and can disturb electrolyte balance with prolonged use.
Why silver? Silver ions attack bacteria through multiple mechanisms simultaneously, making resistance far less likely than with conventional antibiotics — a key concept for exams and for understanding why burn units favor it. Beyond anti-infectives, burn care includes dressings (which protect, absorb, and keep the wound moist), pain management, fluid and nutrition support, and prevention of further injury — a team effort in which nursing assessment (wound appearance, odor, drainage, surrounding redness, fever, and the person's report) is the early-warning system for infection.
Burns and nursing scope
Burn depth and total body surface area are assessed by the team using standardized tools; dressing changes and topical applications are performed under institutional protocols and prescriber orders. What never varies is the nursing core: clean or sterile technique per policy, careful observation and documentation of the wound and the person's response, aggressive infection vigilance, and compassionate care for a person in significant pain and distress. Scope of practice for wound-care tasks varies by state, setting, and facility — always confirm before acting.
Common Confusions
| Do not confuse | With | Difference |
|---|---|---|
| Eczema | Fungal infection | Eczema is inflammatory (itchy, poorly defined, often in creases); fungal rashes are typically ring-shaped with a clear border — and are treated with antifungals, not steroids (steroids can mask fungal infection) |
| "Antibiotic cream" | Anti-infective | Anti-infective is the broader term covering antifungals, antivirals, antiparasitics, and silver-based burn products — most skin anti-infectives are not antibiotics at all |
| Azoles | Allylamines | Both block fungal membrane formation but at different enzyme steps; both are antifungals, and choice depends on the organism and site |
| Silver sulfadiazine | Mafenide acetate | Both are burn anti-infectives, but mafenide penetrates eschar deeply (and stings; can affect acid–base balance), while silver sulfadiazine is a soothing surface cream |
| Treating the person with scabies | Treating everyone at risk | Scabies spreads to close contacts — treatment of contacts and laundering of bedding/clothing are part of the regimen, not optional extras |
Eli explains
The same idea, in plain words
Explain it like I’m 10
Some skin problems happen because the skin's protection is weak (eczema), some because tiny creatures or fungi are living on the skin (fungal infections, scabies), and some because the skin itself is burned away. For eczema, we fix the wall with lotion and calm the redness with cream. For fungus and bugs, we use medicine that poisons the fungus or the bug but not us. For burns, the wall is gone, so germs can walk right in — we put special silver cream on the wound that kills germs, and we watch very carefully for signs of infection.
Worked example
Patient A: A child with eczema is brought in with red, itchy patches in the elbow creases. The plan is the eczema triad: daily emollient, a low-potency topical corticosteroid for the flare, and trigger avoidance (fragrant soaps, rough fabrics). The nurse's teaching covers the soak-and-smear routine, using the steroid only on active patches, and calling if the skin worsens or oozes — signs the plan needs review.
Patient B: A person is admitted with a partial-thickness burn to the forearm. The team's plan includes cleaning, a silver-based topical anti-infective, and a dressing under protocol. The nurse's assessment is the surveillance system: checking the wound at each dressing change for odor, drainage, and surrounding redness; monitoring temperature; and asking about pain. A sudden increase in pain or a foul odor is reported immediately — it may signal infection under the dressing.
Both patients needed different drugs, but both needed the same nursing core: accurate assessment, clear teaching, careful documentation, and respectful, person-first care.
Safety note: These scenarios describe drug classes, mechanisms, and care roles only — no doses, concentrations, dressing schedules, or treatment protocols are implied. Burn and dermatology care varies with wound characteristics, guidelines, and institutional policy. Always verify against current references, the facility formulary, and the prescriber's orders.
Key takeaways
- Eczema = barrier defect + inflammation: emollients restore the barrier (always), topical corticosteroids calm flares, topical calcineurin inhibitors are steroid-free options for sensitive sites.
- Fungal drugs block ergosterol: azoles and allylamines attack the fungal membrane pathway at different steps; complete the course, keep skin dry.
- Antivirals for herpes (e.g., acyclovir) mimic DNA building blocks and halt viral replication.
- Permethrin kills scabies mites and lice by neurotoxicity to the arthropod; treatment of close contacts and environmental measures are essential.
- Burns = total barrier loss = infection is the central threat; silver-based agents (silver sulfadiazine, silver nitrate) and mafenide acetate are topical anti-infectives that keep wound bacteria low.
- Mafenide penetrates eschar but stings and can affect acid–base balance; silver ions are broadly antimicrobial with low resistance potential.
- Nursing = assessment, application, monitoring, teaching, and documentation — infection signs (odor, drainage, redness, fever, increased pain) are the nurse's call to action.
- Scope varies by jurisdiction, setting, and institutional policy — confirm before performing wound-care tasks.
Check yourself
6 review questions from the chapter. Try each one, then open the answer.
What are the three tiers of eczema treatment, and what does each accomplish?
Show answer
Emollients restore the barrier and reduce water loss; topical corticosteroids calm inflammation during flares; topical calcineurin inhibitors provide steroid-free inflammation control for sensitive sites.
How do azole and allylamine antifungals stop a fungus, and why must patients finish the full course?
Show answer
Both block steps in the synthesis of ergosterol, the fat fungal membranes need — without it the fungus dies. Full courses matter because fungi are persistent and stopping early invites recurrence and resistance.
Why is infection the central threat in burn wounds, and how do silver-based agents help?
Show answer
A burn destroys the skin barrier, leaving a warm, moist, protein-rich wound where bacteria multiply readily. Silver ions attack bacteria by multiple mechanisms, keeping wound bacterial counts low with little resistance potential.
What is the key advantage of mafenide acetate over other burn anti-infectives, and what are its drawbacks?
Show answer
It penetrates burn eschar deeply, reaching infection beneath the dead tissue crust; drawbacks include stinging on application and potential acid–base effects, so its use is reserved and monitored.
Why is permethrin effective against scabies and lice but not considered dangerous at typical topical use?
Show answer
Permethrin paralyzes and kills mites and lice by acting on their nervous systems; at typical topical use its effect on arthropod nerve signaling does not translate into harm to the person, though it should only be used as directed.
What wound findings should a nurse report promptly as possible signs of burn-wound infection?
Show answer
Foul odor, change in drainage (color, amount, character), increasing surrounding redness, warmth, new or increased pain, and fever — any of these should be reported promptly per policy.
Study tools & related lessonsKey vocabulary · Related
Key vocabulary
- Atopic dermatitis
- The medical name for eczema — a chronic itchy, inflammatory skin disease
- Emollient
- A moisturizing product that restores the skin barrier
- Topical calcineurin inhibitor
- A non-steroid drug (tacrolimus, pimecrolimus) that blocks T-cell activation
- Dermatophyte
- A fungus that lives on keratin in skin, hair, and nails
- Ergosterol
- The fat that fungal cell membranes need to stay intact
- Permethrin
- A topical agent that paralyzes and kills mites and lice
- Eschar
- The dead tissue crust that forms on a deep burn wound
- Silver ion
- A broad-spectrum antimicrobial released by silver-based products
- Anti-infective
- An agent that kills or suppresses microorganisms (broader than "antibiotic")
Sources & references
This lesson was adapted from the open educational references above; their licenses and attributions are preserved. See Copyright & Licensing.
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