Lichen planus is a chronic inflammatory condition that affects the skin, hair, nails, and mucous membranes (like the mouth and genitals). It is not a type of “lichen” (the plant-like organism), but it gets its name because the rash often looks like the mossy growth found on rocks.
Crucially, lichen planus is not contagious—you cannot catch it or pass it on to others. It is widely believed to be an autoimmune reaction, where your body’s immune system mistakenly attacks its own cells.
1. Common Symptoms (The “6 Ps”)
Doctors often use the “6 Ps” to identify the classic skin version of this condition:
Planar: Flat-topped bumps.
Purple: Or violaceous/reddish-brown in color.
Polygonal: The bumps have irregular, many-sided shapes.
Pruritic: They are extremely itchy.
Papules & Plaques: Small bumps or larger raised patches.
Where it appears:
Skin: Often found on the inner wrists, forearms, and ankles. You may see fine, lacy white lines on top of the bumps called Wickham striae.
Mouth (Oral): Appears as lacy white patches, red swollen tissues, or painful open sores. It can cause a burning sensation when eating spicy or acidic foods.
Nails: Can cause ridges, thinning, splitting, or even temporary nail loss.
Scalp: Known as lichen planopilaris, it can lead to redness, irritation, and permanent hair loss if not treated.
2. Potential Triggers
While the exact cause is unknown, certain factors can trigger a flare-up:
Hepatitis C infection (often screened for by doctors).
Certain medications (NSAIDs, certain heart/blood pressure meds, or some arthritis treatments).
Allergies to metals (like mercury in dental fillings) or chemicals.
Stress is a significant factor that can worsen symptoms or trigger a recurrence.
3. Treatment & Management
There is currently no permanent cure, but the condition often resolves on its own within 6 to 18 months for skin cases. Oral or genital lichen planus tends to be more chronic.
| Treatment Type | Examples | Purpose |
| Topical Steroids | Clobetasol, Hydrocortisone | Reduces inflammation and itching. |
| Calcineurin Inhibitors | Tacrolimus (Protopic) | Useful for sensitive areas like the mouth or genitals. |
| Antihistamines | Cetirizine, Loratadine | Helps manage the intense itching. |
| Phototherapy | Narrowband UVB | Uses light to clear widespread skin rashes. |
| Retinoids | Acitretin | Used for more severe, stubborn cases. |
Self-Care Tips:
For skin: Avoid scratching (which can lead to new lesions) and use cool compresses or oatmeal baths.
For mouth: Switch to a mild, SLS-free toothpaste and avoid spicy, acidic, or “sharp” foods (like chips) that can tear the mucosa.
When to See a Doctor
It is important to get a formal diagnosis (often via a small skin biopsy) because lichen planus can look like other conditions like eczema or thrush. Additionally, erosive oral lichen planus carries a very small risk of developing into skin cancer, so regular dental or dermatological check-ups are recommended.
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