 This is a multi-center study with a planned total enrollment of about 200 subjects ages 2-17 years old with psoriasis and 100 aged-match controls. Patient and family history will be recorded. All subjects will undergo standard height, weight, blood pressure, and waist circumference WC. For the obese and overweight subjects we will also obtain their growth charts to attempt to correlate weight gain with psoriasis onset and progression. All data will be compiled and then statistically analyzed. 