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Pityriasis versicolor — Clinical Guidelines

Overview

Pityriasis versicolor is a chronic superficial fungal infection caused by Malassezia yeasts, characterized by scaly, discolored patches on the skin, often affecting the trunk and upper extremities. 2

Diagnosis

Clinical presentation of scaly, hyperpigmented or hypopigmented macules and patches.

Potassium hydroxide (KOH) microscopy of skin scrapings to identify fungal elements.

Digital epiluminescence dermatoscopy can assist in identifying peripheral scaling, offering higher magnification and convenient imaging for teaching and research. 5

Management

First-line treatment: Topical antifungal agents such as ketoconazole (2% cream) applied twice daily for 4 weeks.

Adjunctive treatment: Combination therapy with adapalene gel (0.1%) at night and ketoconazole cream (2%) in the morning shows potential for enhanced efficacy, though statistical significance is pending. 2

Consideration for resistant cases: Exploring alternative antifungal agents to prevent resistance development.

Special Populations

Comorbidities: TNF inhibitors, particularly infliximab, are significantly associated with potential drug-induced skin conditions including pityriasis rosea, though not directly linked to pityriasis versicolor in this review. Caution advised in patients on these medications. 1

Pediatrics: No specific pediatric considerations mentioned in the abstracts.

Elderly: No specific considerations noted for elderly patients in the provided abstracts.

Pregnancy: No specific guidelines or studies addressing pityriasis versicolor management during pregnancy are included in the abstracts.

Key Recommendations

Use topical ketoconazole 2% cream twice daily as first-line treatment for 4 weeks (Evidence: Moderate 2).

Consider combination therapy with adapalene gel and ketoconazole for enhanced efficacy, though further studies are needed to confirm statistical significance (Evidence: Weak 2).

Monitor patients on TNF inhibitors for potential drug-induced dermatological reactions, including those resembling pityriasis versicolor (Evidence: Moderate 1).

References

1 Mashoudy KD, Ye-Tay J, Nouri K. A retrospective analysis of medications associated with pityriasis rosea reported in the FDA adverse events reporting system. Archives of dermatological research 2025. link 2 Bakr E, Abdo H, Abd-Elaziz H, Abd-Elrazek H, Amer M. Adapalene gel 0.1% vs ketoconazole cream 2% and their combination in treatment of pityriasis versicolor: A randomized clinical study. Dermatologic therapy 2020. link 3 Mattox AR, Chappell JA, Hurley MY. New-onset vitiligo during long-term, stable infliximab treatment of pityriasis rubra pilaris. Journal of drugs in dermatology : JDD 2013. link 4 Chuh AA. Pityriasis rosea: roles of the dermatology nurse. Dermatology nursing 2004. link 5 Chuh AA. The use of digital epiluminescence dermatoscopy to identify peripheral scaling in pityriasis rosea. Computerized medical imaging and graphics : the official journal of the Computerized Medical Imaging Society 2002. link00036-2) 6 Wolf R, Wolf D, Trau H. Pityriasis alba in a psoriatic location. Acta dermato-venereologica 1992. link 7 Kaplan B, Grunwald MH, Halevy S. Pityriasis rosea-like eruption associated with BCG vaccination. Israel journal of medical sciences 1989. link

Pityriasis versicolor