LPP, or lichen planus pigmentosus, is a skin condition considered a variant of lichen planus. First described by Shima in 1956, it's characterized by the gradual appearance of blue-brown spots (macules) on sun-exposed areas and skin folds (flexures). While usually appearing on sun-exposed areas, in rare cases, it can affect the entire body.
Understanding Lichen Planus Pigmentosus (LPP)
LPP is a type of lichen planus, a chronic inflammatory condition impacting the skin, hair, nails, mouth, and genitals. In LPP, the inflammation manifests as distinct, discolored patches on the skin.
Key Characteristics of LPP:
- Appearance: Oval or irregularly shaped brown to grayish-brown macules and patches.
- Location: Primarily on sun-exposed areas like the forehead, but also in flexural areas (joints).
- Onset: Insidious (gradual and subtle).
- Prevalence: More common in people with darker skin tones.
Several sources describe LPP's connection to lichen planus, highlighting its similar inflammatory nature but distinct presentation as hyperpigmented macules. The condition is relatively rare and may occasionally appear generalized.
Lichen Planus (General):
To understand LPP better, it's crucial to understand lichen planus. Lichen planus is a common inflammatory condition causing a variety of skin manifestations, including:
- Purple, itchy, flat bumps.
- Red, thick, or scaly scalp patches.
- Scalp pain, itching, or burning.
It's important to consult a dermatologist for diagnosis and treatment of any suspected skin condition, including LPP or lichen planus. They can differentiate between LPP and other skin conditions with similar appearances.
