Psoriasis on the hands for many years is a chronic condition, but it can be well-controlled with the right treatment and skin care. Mild cases are usually managed with regular use of moisturisers and medicated creams like topical steroids, vitamin D analogues such as Calcipotriol, or combination creams as prescribed by a doctor. If symptoms are more severe or not improving, treatments like phototherapy (light therapy) or oral medicines may be needed under specialist guidance. It is also important to avoid triggers like stress, skin injury, harsh soaps, and cold weather, and to keep the skin well moisturised. Since your condition is long-standing, it is best to consult a dermatologist for a personalised treatment plan and regular follow-up.