Differential Diagnosis for Pruritic Hypopigmentation
Single Most Likely Diagnosis
- Pityriasis alba: A common, benign condition characterized by hypopigmented patches, often accompanied by mild pruritus, typically seen in children and young adults.
Other Likely Diagnoses
- Pityriasis versicolor: A fungal infection caused by Malassezia species, leading to hypopigmented or hyperpigmented macules, often with pruritus.
- Nummular dermatitis: A type of eczematous dermatitis presenting with coin-shaped, hypopigmented patches, usually pruritic.
- Seborrheic dermatitis: An inflammatory skin condition causing hypopigmented or erythematous patches, often with pruritus, typically on the scalp, face, and torso.
Do Not Miss Diagnoses
- Hansen's disease (Leprosy): A chronic bacterial infection that can cause hypopigmented skin lesions with pruritus, loss of sensation, and potential for severe disability if left untreated.
- Sarcoidosis: A systemic granulomatous disease that may present with hypopigmented skin lesions, pruritus, and other systemic symptoms, requiring prompt diagnosis and treatment.
Rare Diagnoses
- Idiopathic guttate hypomelanosis: A rare condition characterized by multiple, small, hypopigmented macules, often without pruritus, but can be itchy in some cases.
- Progressive macular hypomelanosis: A rare condition presenting with hypopigmented macules, usually without pruritus, but can be associated with mild itching in some cases.