Is the neem leaves with turmeric powder paste be applied for lichen planus affected area?

Yes it can be: Listen to your body. It is reported that neem and turmeric made into a paste and applied to lichen planus can help in a week. It is a relatively non toxic therapy. If you notice skin irritation discontinue use. Topical vitamin d oil might be helpful as well.

Questionable: Have known of neem leaves making eczema worse, never have seen it used for lichen planus. Always do a test patch in a small area before trying something new.

Turmeric : High-dose curcuminoids from turmeric (curcuma longa) possess antiinflammatory properties & may be efficacious reducing symptoms & signs of lichen planus. Research studies have shown conflicting results & the evidence is better for the oral form. Turmeric is one of the safest cam remedies in use for centuries by multiple cultures. Check with your dr. To make sure no contraindications are present.