Hello, Welcome to healthcare magic. Psoriasis is a chronic disorder with remissions and relapses. As you might be aware, it can be well controlled with treatment, though there is no definite cure for it. The management depends on the extent of psoriasis. Some ways to prevent newer lesions would be to keep the skin moisturized, cut down stress levels, prevent infections and to stop alcohol consumption. Moisturization plays a key role as dry skin tends to worsen psoriasis. Dry skin could be itchy and psoriasis tends to spread on areas of trauma (from scratching). Moisturize often especially at the beginning of winters ( when psoriasis could flare) and also if you are in an air conditioned atmosphere. Stress has found to have a direct role in relapses. Do continue yoga and other stress management techniques which will help in preventing relapses. Infections, especially throat infections could lead to flare ups. Treat an infection promptly. Alcohol has also found to have a direct correlation with psoriasis. Try to cut down or stop alcohol consumption completely to prevent flares. Hope you find this helpful. Take care.