Differential Diagnosis for Lichen Planus Pigmentosus
- Single most likely diagnosis
- Melasma: This condition is characterized by patches of discoloration, typically on the face, and can be mistaken for lichen planus pigmentosus due to the similar presentation of hyperpigmentation.
- Other Likely diagnoses
- Post-inflammatory hyperpigmentation (PIH): This condition occurs after inflammation or injury to the skin, leading to areas of hyperpigmentation that can resemble lichen planus pigmentosus.
- Erythema dyschromicum perstans: A condition that presents with asymptomatic, progressive, and persistent hyperpigmentation, which can be difficult to distinguish from lichen planus pigmentosus.
- Ashy dermatosis: Characterized by grayish-brown patches on the face, neck, and arms, which can be similar in appearance to lichen planus pigmentosus.
- Do Not Miss
- Addison's disease: Although rare, this condition can cause hyperpigmentation and must be considered due to its potential severity and the need for prompt treatment.
- Hemochromatosis: A genetic disorder that can lead to skin hyperpigmentation, among other symptoms, and requires early diagnosis to prevent complications.
- Rare diagnoses
- Arsenic poisoning: Can cause hyperpigmentation, among other skin manifestations, and is essential to consider due to its potential toxicity.
- Fixed drug eruption: A condition that can present with hyperpigmentation after resolution of the eruption, which might be mistaken for lichen planus pigmentosus.
- Pigmented contact dermatitis: A rare condition that can cause hyperpigmentation due to an allergic reaction to certain substances.