Skin disorders have some deep etiology according to ayurveda, applying anything externally only may have symptomatic benefits that too for a short time.
Your wife should chew 4-5 neem leaves and add haldi and tulsi in her diet.
Now coming to the external application part, if she’s having dry skin, she should apply coconut oil with some naushadar added in it for a quick relief.
Next Steps
Consultation with ayurvedacharya to eliminate the root of the disease is always the best approach
Health Tips
Avoid dahi, mooli, aachar, foods having ajinomoto as a ingredient and fried food