Chronic eczema and lichen simplex chronicus are both common and typical chronic dermatitides with irresistible pruritus, infiltrated plaques or lichenified lesions.

• 慢性湿疹和慢性单纯性苔藓是临床上常见的具有顽固性瘙痒、皮肤浸润肥厚或苔藓样变等表现的典型慢性皮炎。