I am an 18 year old teen infected with psoriasis.  I have faint dry skin patches all over my knees and elbows that causes severe itching and unbearable during the winter months. Is there a permanent cure for psoriasis in Ayurvedic medicine?

I am a 24 year old woman and I like doing yoga a couple of times during the week. Exercise makes me feel a lot better. One of my friends told me that I should restrict performing yoga during menstruation. What is the reason behind not doing yoga when a woman has her period?