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Lichen simplex chronicus (LSC) is a skin disorder characterized by chronic itching and scratching. The constant scratching causes thick, leathery, brownish skin.
This is a skin disorder characterized by a self-perpetuating scratch-itch cycle:
It may begin with something that rubs, irritates, or scratches the skin, such as clothing.
This causes the person to rub or scratch the affected area. Constant scratching causes the skin to thicken.
The thickened skin itches, causing more scratching, causing more thickening.
The skin may become leathery and brownish in the affected area.
This disorder may be associated with
atopic dermatitis ( eczema) or psoriasis. It may also be associated with nervousness, anxiety, depression, and other psychological disorders.
It is common in children, who chronically scratch
insect bites and other areas. It can also be common in mentally retarded children who have chronic repetitive movements.
Treatment is aimed at reducing itching and minimizing existing lesions because rubbing and scratching cause LSC. The itching and inflammation may be treated with a lotion or
steroid cream applied to the affected area of the skin.
Diseases of the skin and subcutaneous tissue ( integumentary system) ( L, 680-709)
( Staphylococcus Staphylococcal scalded skin syndrome, Impetigo, Boil, Carbuncle) - Cellulitis ( Paronychia) - Acute lymphadenitis - Pilonidal cyst - ( Corynebacterium Erythrasma)
Pemphigus - Pemphigoid ( Bullous pemphigoid) - Dermatitis herpetiformis
Dermatitis and eczema
Atopic dermatitis - Seborrhoeic dermatitis ( Dandruff, Cradle cap) - Diaper rash - Urushiol-induced contact dermatitis - Contact dermatitis - Erythroderma - Lichen simplex chronicus - Prurigo nodularis - Itch - Pruritus ani - Nummular dermatitis - Dyshidrosis - Pityriasis alba
Psoriasis ( Psoriatic arthritis) - Parapsoriasis ( Pityriasis lichenoides et varioliformis acuta, Pityriasis lichenoides chronica) - Pityriasis rosea - Lichen planus - Pityriasis rubra pilaris
Urticaria and erythema
Urticaria ( Dermatographic urticaria, Cholinergic urticaria) - Erythema ( Erythema multiforme, Stevens-Johnson syndrome, Toxic epidermal necrolysis, Erythema nodosum, Erythema annulare centrifugum, Erythema marginatum)
Sunburn - Actinic keratosis - Polymorphous light eruption - Radiodermatitis - Erythema ab igne
Disorders of skin appendages
nail disease: Ingrown nail - Onychogryposis - Beau's lines - Yellow nail syndrome
follicular disorders: Alopecia areata ( Alopecia universalis) - Androgenic alopecia - Telogen effluvium - Lichen planopilaris - Trichorrhexis nodosa - Hypertrichosis ( Hirsutism) - Acne vulgaris - Rosacea ( Perioral dermatitis, Rhinophyma) - Epidermoid cyst - Sebaceous cyst - Pseudofolliculitis barbae - Hidradenitis suppurativa
sweat disorders: Miliaria - Anhidrosis - Body odor - Chromhidrosis
pigmentation ( Vitiligo, Melasma, Freckle, Café au lait spot, Lentigo/ Liver spot) - Seborrheic keratosis - Acanthosis nigricans - Callus - Pyoderma gangrenosum - Bedsore - Keloid - Granuloma annulare - Necrobiosis lipoidica - Granuloma faciale - Lupus erythematosus - Morphea - Calcinosis cutis - Sclerodactyly - Ainhum - Livedoid vasculitis
congenital ( Q80-Q84, 757)