Head and Neck Enter skin area involved (palm method) as well as redness, thickness and scale grades for the head and neck. Skin Area Involved: 00.511.522.533.544.55678910palms Redness: 01234 Thickness: 01234 Scale: 01234 Upper Extremities Enter skin area involved (palm method) as well as redness, thickness and scale grades for the arms. Skin Area Involved: 01234567891011121314151617181920palms Redness: 01234 Thickness: 01234 Scale: 01234 Trunk Enter skin area involved (palm method) as well as redness, thickness and scale grades for the trunk. Include axillae and groin. Skin Area Involved: 0123456789101112131415161718192021222324252627282930palms Redness: 01234 Thickness: 01234 Scale: 01234 Lower Extremities Enter skin area involved (palm method) as well as redness, thickness and scale grades for the legs. Include buttocks. Skin Area Involved: 012345678910111213141516171819202122232425262728293031323334353637383940palms Redness: 01234 Thickness: 01234 Scale: 01234 PASI Score Calculator