Pityriasis alba in a psoriatic location.

Area of Science:

• Dermatology
• Clinical Case Reports

Background:

• Pityriasis alba is a common, benign skin condition often affecting children and young adults.
• Typical presentation involves hypopigmented, slightly scaly macules or patches, commonly on the face, trunk, and upper extremities.

Observation:

• This report details three pediatric patients presenting with pityriasis alba exclusively on the knees.
• The lesions were characterized by hypopigmentation and mild scaling, consistent with pityriasis alba.

Findings:

• The localized presentation on the knees led to initial diagnostic uncertainty, with psoriasis being a differential diagnosis.
• Histopathological examination was not performed, diagnosis was clinical.

Implications:

• Physician awareness of this knee-predominant variant of pityriasis alba is essential to prevent misdiagnosis.
• Correctly identifying this condition avoids unnecessary treatments for misdiagnosed conditions like psoriasis.