Both psoriasis and eczema are inherited inflammatory conditions that can present with rashes. Both tend to flare with changes of temperature and climate, and with stress. Eczema usually first appears in childhood, and consists of inflamed, red patches that are very itchy. The rash usually appears on the insides of the arms, behind the knees and on the neck (‘flexor’ surfaces). Those with eczema often also have a personal or family history of allergies, asthma or hay fever. Psoriasis can appear at any age, but usually in adulthood, and presents with thick red, scaly patches on the knees, outside the elbows (‘extensor’ surfaces), and buttocks, and is usually not itchy. Using moisturizers can help decrease flares of both conditions, which tend to worsen when the skin is dry.