How to distinguish scalp psoriasis from seborrheic dermatitis? Scalp seborrheic dermatitis and scalp psoriasis are the most difficult to distinguish clinically. They can be generally differentiated by the table below. If it is difficult to determine one from another clinically, a “sebopsoriasis” diagnosis will be temporary made due to the overlapping features between them. Dermatologists will wait and see if there are more typical lesions developed on other sites later on. How to diagnose psoriasis?  The detective spirit: Don’t forget to check the hairline, ears, genital area, umbilicus, intergluteal folds, and nails. The interesting part of being a dermatologist is…