This presentation can be seen with many skin diseases. The best option is to consult a Dermatologist in person to understand the problem and get it diagnosed. A proper treatment can then be started. Discuss the situation and hope it will be cleared in few days. Don't delay the appointment. You can use a bland moisturiser till then and OTC anti-allergic medications. Also psoriasis needs to be managed appropriately. Now its believed to be a multi system disorder involving joints, hearts and kidneys as well.Most of the patients do well if they stick to the recommendations. Hope it helps you.