Lichen planus, also known as recessive congenital ichthyosis vulgaris-like erythroderma, is a rare hereditary keratotic skin disease that is autosomal recessive in nature. The following diseases may also be the cause of laminar ichthyosis: 1. Erysipelas, also known as exfoliative dermatitis, is a serious systemic disease and is generally considered to be the same disease as exfoliative dermatitis, with the former characterized by extensive erythematous infiltrates with furfuraceous desquamation, and the latter by the presence of extensive edematous erythema with massive desquamation. An area of skin involvement of ≥90% is a prerequisite for the diagnosis of this disease. 2, ichthyosis Ichthyosis is a group of hereditary keratosis disorder skin diseases, mainly manifested as dry skin. It is accompanied by ichthyosiform flaking. The disease mostly develops in children, mainly manifests as dry and rough skin on the extremities or trunk, accompanied by rhombic or polygonal scales, with the appearance of fish scale or snakeskin. It is aggravated in cold and dry seasons and relieved in warm and humid seasons. It is easy to recur. Mostly genetic factors cause abnormal epidermal cell proliferation and differentiation, resulting in increased cell proliferation and/or decreased cell shedding. 3.ichthyosis linearis circumflexa, also known as Netherton syndrome, is an autosomal recessive disease. The pathogenesis is not well understood. It appears at birth or shortly after birth. The lesions are generalized wandering annular or polycyclic erythema and scaling with distinctive “bilateral” scaling around the periphery, which is specific. The generalized erythema and dry and slender scales are like psoriasis. 4. lamellar ichthyosis lamellar ichthyosis, also known as recessive congenital ichthyosis erythroderma, is a rare genetic keratosis, which is autosomal recessive. 5, follicular ichthyosis follicularis ichthyosis is also known as baldness keratosis pilaris decalvans. The etiology is unknown. The pathogenesis is unclear. Prevalent on the face of infants, the lesions appear as corn rashes with central keratosis, some spiny, and after healing, skin atrophy is formed. Mainly stop hot air dry, perm, etc. for treatment. 6, congenital bullous ichthyosiform erythroderma (congenital bullous ichthyosiform erythroderma), also known as ichthyosiform erythroderma (bullous type), bullous ichthyosiform hyperkeratosis, dominantly inherited congenital ichthyosiform erythroderma, epidermolysis bullosa hyperkeratosis erythroderma. It is a congenital disease with autosomal dominant inheritance.