pityriasis


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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

(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.

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.
References in periodicals archive ?
Clinical profile of pityriasis versicolor in referral hospital of West Bengal.
Other causes were Mycosis fungoides, Allergic/ Airborne contact dermatitis, Lichen planus and Pityriasis rubra pilaris.
Pityriasis rosea (PR) is a self-limiting exanthematic disease, due to an endogenous reactivation of HHV-6 and/or HHV-7.
Other dermatological conditions which may give rise to hyperkeratosis include lichen planus and pityriasis rubra pilaris.
Objective: To make a comparison between terbinafine 1% cream and ketoconazole 2% cream in the treatment of pityriasis versicolor.
The symptoms on his face had been misdiagnosed as a skin infection called erysipelas, while his shoulder was treated as a rash called pityriasis versicolor.
On sites other than the face, many dermatoses show the histology of spongiotic dermatitis: pityriasis rosea, erythema annulare centrifugum, Gianotti-Crosti syndrome, and small-plaque parapsoriasis.
The superficial fungal infections include those caused by dermatophytes (such as tinea capitis, tinea faciei, tinea corporis, tinea unguium, tinea manuum, and tinea pedis) and nondermatophytes such as pityriasis versicolor, cutaneous candidiasis, tinea nigra, black piedra, and white piedra [2].
This fungus can cause pityriasis versicolor, Malassezia folliculitis, and seborrheic dermatitis.