pityriasis


Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.
Related to pityriasis: pityriasis versicolor, pityriasis alba, tinea versicolor, Pityriasis lichenoides, pityriasis rubra pilaris, Pityriasis capitis

pityriasis

 [pit″ĭ-ri´ah-sis]
any of various skin diseases characterized by the formation of fine, branny scales.
acute lichenoid pityriasis an acute or subacute, sometimes relapsing, widespread macular, papular, or vesicular eruption that tends to crusting, necrosis, and hemorrhage; when it heals it leaves pigmented depressed scars, followed by a new crop of lesions. Progression to the chronic lichenoid form occasionally occurs.
pityriasis al´ba a chronic condition with patchy scaling and hypopigmentation of the skin of the face.
chronic lichenoid pityriasis a chronic brown to red-brown scaly macular eruption, seen mainly on the trunk, with epidermal changes and a perivascular lymphocytic infiltrate. It may arise independently or happen as a progression of the acute lichenoid form.
pityriasis ro´sea a common acute or subacute, self-limited exanthematous disease of unknown etiology. It begins with a solitary red to tan plaque (herald plaque), usually on the trunk, arms, or thighs, which is followed by similar but smaller papular or macular lesions; these later may peel and leave a scaly collarette.
pityriasis ru´bra pila´ris a chronic inflammatory skin disease marked by pink scaling macules and cone-shaped horny follicular papules; it usually begins with severe seborrhea of the scalp and face, associated with keratoderma of palms and soles.
pityriasis versi´color tinea versicolor.

pit·y·ri·a·sis

(pit-i-rī'ă-sis),
A dermatosis marked by branny desquamation.
[G. fr. pityron, bran, dandruff]

pityriasis

/pit·y·ri·a·sis/ (pit″ĭ-ri´ah-sis) any of various skin diseases characterized by the formation of fine, branny scales.
pityriasis al´ba  a chronic condition with patchy scaling and hypopigmentation of the skin of the face.
pityriasis ro´sea  a dermatosis marked by scaling, pink, oval macules arranged with the long axes parallel to the cleavage lines of the skin.
pityriasis ru´bra pila´ris  a chronic inflammatory skin disease marked by pink scaling macules and horny follicular papules, beginning usually with seborrhea of the scalp and face, with keratoderma of palms and soles.
pityriasis versi´color  tinea versicolor.

pityriasis

(pĭt′ĭ-rī′ə-sĭs)
n. pl. pityria·ses (-sēz′)
Any of various skin diseases of humans and animals, characterized by epidermal shedding of flaky scales.

pityriasis

[pitərī′əsis]
Etymology: Gk, pityron, bran
any of a number of skin diseases that have in common lesions that resemble dandrufflike scales without obvious signs of inflammation.

pit·y·ri·a·sis

(pit'i-rī'ă-sis)
A dermatosis marked by branny desquamation.
[G. fr. pityron, bran, dandruff]

pityriasis

Any skin condition featuring bran-like scaling of the skin.

pityriasis

a group of skin diseases in humans characterized by branlike scales on the skin surface. The skin is not thickened and its surface is unbroken. Pityriasis rosea of pigs is the only diseases in animals that is similar.

pityriasis rosea
a disease of pigs, most commonly white breeds such as Landrace, up to 3 months old characterized by circular lesions 1 inch (2-3 cm) diameter which often coalesce to produce large irregular lesions. The central area of the lesion is an area of comparatively normal skin, covered by thin brown scales and surrounded by a very narrow, 1 to 2 mm raised zone of erythema. There is no irritation or no bristle loss and spontaneous recovery is usual. The etiology is unknown. Called also porcine juvenile pustular psoriasiform dermatitis, pseudoringworm.
References in periodicals archive ?
These organisms can induce pityriasis versicolor and have an important role as an aggravating factor in several skin diseases such as atopic dermatitis and seborrheic dermatitis, especially in atopic dermatitis they act as an exacerbating allergic factor.
One case of pityriasis rosea was diagnosed in cat-1, but no literature mentions it as an opportunistic infection (OI).
Role of bromelain in the treatment of patients with pityriasis lichenoides chronica.
An alternative treatment for pityriasis versicolor, tinea cruris, tinea corporis and tinea faciei with topical application of honey, olive oil and beeswax mixture: an open pilot study.
INTERESTING CHARACTER FACT: Frasier suffered from the skin condition pityriasis on his bottom when he was younger.
18) Human herpesvirus 7 has been linked to pityriasis rosea.
Henoch-Schonlein purpura, psoriasis, pityriasis lichenoides, pityriasis rosea, lichen planus, pityriasis rubra pilaris, erythema multiforme, atopic dermatitis, granuloma annulare, and pigmented purpuric dermatosis were the most frequent skin disorders diagnosed dermatopathologically.
Resolving pityriasis rubra pilaris resembling erythema gyratum repens.
OBJECTIVES: Pityriasis lichenoides chronica (PLC) is a skin disease of unknown etiology.
But after a series of tests doctors finally diagnosed it as the rare chronic skin disease PRP - pityriasis rubra pilaris.
Pityriasis rosea is an 'inflammatory' skin disorder that mostly affects people between the ages of 10-35 years, but younger and older people may be affected.