The differential diagnosis of PR includes nummular eczema, pityriasis lichenoides chronica, guttata psoriasis, drug eruption, syphilis, and, in the case of pregnancy, polymorphic and atopic eruptions of pregnancy [ 3, 4 ]. Pityriasis rosea typically occurs once in a lifetime but may recur, is communicable and is associated with other factors Diagnosis. In most cases, your health care provider can identify pityriasis rosea by looking at the rash. You might need a scraping or possibly a skin biopsy, which involves taking a small piece of the rash for testing. This test can help tell a pityriasis rosea rash from other, similar rashes. Request an appointment. Pityriasis rosea: Itching caused by pityriasis rosea can be treated with topical creams, internal anti itching pills and light therapy with a uvb phototherapy unit. Created for people with ongoing healthcare needs but benefits everyone. asis rosea is the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Patient concerns: We present the case of a female patient in whom the diagnosis of pityriasis rosea led to the investigation and diagnosis of the SARS-CoV-2 infection. The patient presented to the Department of Dermatology for a 3 week duration of an extremely pruritic erythematous-squamous lesion, initially on the The differential diagnoses of guttate psoriasis include tinea corporis, secondary syphilis, nummular eczema, and pityriasis rosea. Guttate psoriasis can be distinguished from these entities by history and physical exam, although further studies such as potassium hydroxide (KOH) scrapings and serologies may be helpful in ruling out the other Pityriasis versicolor causes patches of skin to change colour. On white skin, the patches are usually pink, red or pale brown. You may notice the patches do not tan in the sun. On brown or black skin, the patches tend to be paler than the surrounding skin. The patches usually appear on the chest, upper back, upper arms, neck or tummy. .

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