诱因包括皮肤外伤、感染、压力和某些药物。皮肤细胞自真皮加速移至表皮处,并在表皮脱落引起发炎症状。

• "Skin injury, infection, stress, and certain drugs may trigger psoriasis. Skin cells move at an accelerated rate from the dermis into the epidermis, where they slough off, causing inflammation."