Pityriasis

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Pityriasis
Classification and external resources
ICD-9	696.5
MeSH	D010915

Pityriasis commonly refers to flaking (or scaling)^[1] of the skin. The word comes from the Greek πίτυρον "bran".

[edit] Classification

Types include:

• Pityriasis lichenoides chronica
• Pityriasis lichenoides et varioliformis acuta
• Pityriasis rosea
  • Pityriasis circinata
• Pityriasis rubra pilaris
• Pityriasis versicolor
• Dandruff, historically called Pityriasis capitis

[edit] See also

• Desquamation
• List of cutaneous conditions

[edit] References

v • d • e Diseases of the skin and subcutaneous tissue (integumentary system) (L, 680-709) Infections Bacterial skin disease Staphylococcus (Staphylococcal scalded skin syndrome, Impetigo, Boil, Carbuncle) · Strep (Impetigo) · Corynebacterium (Erythrasma) Viral skin disease Wart · Molluscum contagiosum · Erythema infectiosum · Exanthema subitum · Herpes simplex (Herpetic whitlow, Eczema herpeticum) General Cellulitis (Paronychia) · Acute lymphadenitis · Pilonidal cyst · Pimple (Pustule) Bullous disorders acantholysis (Pemphigus, Transient acantholytic dermatosis) · Pemphigoid (Bullous, Cicatricial, Gestational) · Dermatitis herpetiformis Inflammatory Dermatitis and eczema Atopic dermatitis · Seborrhoeic dermatitis (Dandruff, Cradle cap) · Contact dermatitis (Diaper rash, Urushiol-induced contact dermatitis) · Erythroderma · Lichen simplex chronicus/Prurigo nodularis · Itch (Pruritus ani, Pruritus scroti, Pruritus vulvae) · Nummular dermatitis · Dyshidrosis · Pityriasis alba Papulosquamous disorders Psoriasis (Psoriatic arthritis) · Parapsoriasis (Pityriasis lichenoides et varioliformis acuta, Pityriasis lichenoides chronica, Lymphomatoid papulosis) · other pityriasis (Pityriasis rosea, Pityriasis rubra pilaris) · other lichenoid (Lichen planus, Lichen nitidus) Urticaria Dermatographic urticaria · Cold urticaria · Cholinergic urticaria · Solar urticaria Erythema Erythema multiforme/ drug eruption Stevens-Johnson syndrome · Toxic epidermal necrolysis · Erythema nodosum  · Acute generalized exanthematous pustulosis Other erythema Erythema annulare centrifugum · Erythema marginatum · Keratolytic winter erythema · Necrolytic migratory erythema · Erythema toxicum Radiation-related disorders Sunburn · actinic rays (Actinic keratosis, Actinic cheilitis) · Polymorphous light eruption (Acne aestivalis) · Radiodermatitis · Erythema ab igne Pigmentation/ Dyschromia hypopigmentation (Albinism, Vitiligo) · hyperpigmentation (Melasma, Freckle, Café au lait spot, Lentigo/Liver spot, Acanthosis nigricans, Acral acanthotic anomaly) Other skin keratosis/hyperkeratosis (Seborrheic keratosis, Callus) · other epidermal thickening (Ichthyosis acquisita, Palmoplantar keratoderma) skin ulcer (Pyoderma gangrenosum, Bedsore) Cutaneous Markers of Internal Malignancy (Florid cutaneous papillomatosis, acanthosis nigricans, sign of Leser-Trelat) atrophic (Lichen sclerosus, Acrodermatitis chronica atrophicans) necrobiosis (Granuloma annulare, Necrobiosis lipoidica) · other granuloma (Granuloma faciale, Pyogenic granuloma) cutaneous vasculitis (Livedoid vasculitis, Erythema elevatum diutinum) Connective tissues collagen disease: Keloid localized connective tissue disorders: Lupus erythematosus (Discoid lupus erythematosus, Subacute cutaneous lupus erythematosus) · Scleroderma/Morphea · Linear scleroderma · Calcinosis cutis · Sclerodactyly · Ainhum integument, SF, LCT navs: anat/physio, noncongen/congen/neoplasia, symptoms+signs/eponymous, proc

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