Final answer:
Psoriasis is the disorder causing thick, red, irritated patches of skin on the scalp. Psoriasis results from the complex interplay between certain cells and cytokines which cause skin cells to grow deep and then rise to the surface.
Step-by-step explanation:
A disorder that refers to thick, crusty patches of red irritated scalp is known as Psoriasis. This is a skin disease causing itchy or sore patches of thick, red skin with silvery scales that usually affect areas like elbows, knees, scalp, back, face, palms, and feet. The complex interplay between keratinocytes, dendritic cells, and T cells, and the cytokines they produce cause this skin condition. The process known as cell turnover, is when skin cells that grow deep in the skin rise to the surface.
It is important to note that other disorders like seborrheic dermatitis, eczema, acne, cold sores, impetigo, scabies, hives, and warts are also common skin disorders, but they differ from psoriasis in symptoms and presentation.
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