CPR APPLICATIONS FOUNDATION · CHAPTER 19 · TREATMENT
Treatment Foundations of Dermatology
Organize the chapter before drilling into individual CPR concepts.
Supplemental foundation map: this page orients the detailed CPR Applications for Chapter 19. It is not part of the canonical CPR object inventory.
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Normal Foundations
Abnormal Foundations
Treatment Foundations · You are here
19.24 · SOURCE CPR FOUNDATION
Concept
Dermatology treatment is mechanism-first therapy matching. Inflammatory rashes may need anti-inflammatory treatment, fungal rashes need antifungals, bacterial infections may need antibiotics or drainage, acne may need keratinization or sebum-targeted therapy, and malignant lesions need biopsy or excision logic. Safety pivots are mucosal involvement, systemic toxicity, necrosis, and melanoma features.
Pattern
Step 1 gives a rash plus prior treatment, pregnancy status, lesion evolution, systemic symptoms, or immune status. Steroids can help eczema and psoriasis but worsen fungal infection. Isotretinoin may be indicated for severe, scarring, or refractory acne and carries major teratogenic risk; pregnancy-prevention safeguards are mandatory when pregnancy is possible, and dangerous rashes require escalation rather than outpatient creams.
Rule
- Match therapy to mechanism. Inflammation, fungus, bacteria, acne, cancer, and drug reactions require different plans.
- Question the diagnosis when treatment worsens the rash. Steroid-worsened annular rash suggests fungus.
- Escalate red flags immediately. Mucosal involvement, systemic toxicity, necrotic infection, or evolving pigmented lesion changes the next step.
Applications
- Eczema flare → topical steroid potency by location
- Annular rash → antifungal not steroid alone
- Abscess → drainage logic
- Severe or scarring acne → consider isotretinoin with appropriate monitoring and strict pregnancy-prevention requirements
- Changing or suspicious pigmented lesion → prompt dermatologic evaluation and an appropriate diagnostic biopsy; ABCDE is a screening aid, not a diagnosis
- Mucosal sloughing after drug → SJS/TEN emergency
- Tip: Wrong topical therapy can hide the real diagnosis
CPR APPLICATIONS · ACTIVE REASONING
Match the skin process to treatment and safety
Commit to an answer before requesting feedback. Full worked explanations remain available if scripts are unavailable. Answers are not transmitted or stored.
Reveal the worked answer and changed-variable challenge
Best answer: Treat the dermatophyte with an appropriate antifungal and reassess steroid use. Corticosteroid alone suppresses inflammation without clearing dermatophytes and can alter their appearance (tinea incognito).
Transfer: How does the treatment choice differ if fungal testing is negative and the lesion is proven to be eczema?
Reveal the worked answer and changed-variable challenge
Best answer: Oral isotretinoin with appropriate monitoring and required pregnancy prevention. Isotretinoin targets severe acne but is teratogenic; selection and monitoring require appropriate professional care.
Transfer: What safety assessment becomes critical before and during isotretinoin treatment in someone who can become pregnant?
Reveal the worked answer and changed-variable challenge
Best answer: Urgent emergency evaluation for a severe cutaneous adverse reaction. The presentation may represent SJS/TEN or another severe drug reaction, requiring immediate medical assessment and management of the suspected medication.
Transfer: How does the management urgency differ for a mild isolated localized rash without systemic signs?
Change the mechanism
Read all comparisons without scripts
- Eczematous inflammatory dermatitis: Appropriate topical anti-inflammatory therapy may be helpful after the diagnosis and body-site risk are considered.
- Confirmed dermatophyte infection: Antifungal therapy targets the organism; steroid monotherapy can mask progression.
- Systemic and mucosal drug-related eruption: Urgent evaluation is required rather than relying on routine topical therapy.
Explain it back: Identify the mechanism, name the most important competing explanation, and predict what changes when the context shifts.
Unscored educational reasoning. Not a validated assessment or individualized clinical recommendation.
How to use this foundation map
- Identify the organizing mechanism.
- Recognize the pattern.
- Restate the rule without looking.
- Test transfer with applications and question practice.
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