Final answer:
Pityriasis lichenoides chronica is a skin condition characterized by itchy, red patches with silvery scales. The cause is unknown, but it is thought to be related to an abnormal immune response. Treatment options include corticosteroids and phototherapy.
Step-by-step explanation:
Pityriasis lichenoides chronica (PLC) is a skin condition characterized by the presence of itchy or sore patches of thick, red skin with silvery scales. It commonly affects areas such as the elbows, knees, scalp, back, face, palms, and feet. The exact cause of PLC is unknown, but it is thought to be related to an abnormal immune response. Treatment options for PLC may include topical corticosteroids, phototherapy, or systemic medications, depending on the severity of the condition.