A 35-year-old male presents with sharply defined, erythematous plaques covered with silvery scales on his elbows and knees. He mentions a family history of similar skin issues. What could be the possible diagnosis?
This patient's presentation of erythematous plaques with silvery scales on extensor surfaces, along with a familial history of skin issues, is characteristic of plaque psoriasis. This is the most common form of psoriasis, a chronic inflammatory skin condition.