Final answer:
The most common variant of psoriasis is plaque psoriasis, characterized by itchy or sore patches of thick, red skin with silvery scales, primarily affecting areas like elbows and knees.
Step-by-step explanation:
The most common variant of psoriasis is plaque psoriasis, which is characterized by itchy or sore patches of thick, red skin with silvery scales. These patches often appear on areas like elbows, knees, scalp, back, face, palms, and feet.
Psoriasis is a result of increased cell turnover due to cytokine activation where skin cells rise to the surface in just a few days instead of the normal one month.
This leads to the development of the thick, inflamed patches on the skin. Other common skin disorders include eczema and acne, but plaque psoriasis is distinct with its silvery scales and rapid cell turnover.