Infection:Streptococcal infection is strongly associated with the development of guttate psoriasis but this may also apply to chronic plaque psoriasis. HIV infection and AIDS – although other comorbid skin conditions may mimic psoriasis. Pityriasis rosea. Seborrhoeic dermatitis. Tinea corporis. Pityriasis rosea is a skin rash. It is benign but may inflict substantial discomfort in certain cases. 5 If the diagnosis is in doubt, tests may be performed to rule out similar conditions such as Lyme disease, ringworm, guttate psoriasis, nummular or discoid eczema, drug eruptions, other viral exanthems. Drug eruptions, tinea corporis, and secondary syphilis may also have papulosquamous morphology. Conclusion: Histopathology serves as a diagnostic tool and rules out other lesions which mimic psoriasis. 4, 5 Other papulosquamous dermatoses are pityriasis rosea, Lichen planus, Seborrheic dermatitis, Pityriasis rubra pilaris and parapsoriasis.
Also, the herald patch tends to have a unique, fine scale with a definite border. Tests to rule out other causes of rashes that may mimic Pityriasis Rosea:. Also consider the following:. Erythrasma: Erythrasma may closely mimic tinea versicolor with pigmentary change and scaling, but satellite lesions are less common, and erythrasma fluoresces pink under a Wood lamp. Other conditions that may look like psoriasis or may occur at the same time as psoriasis include:. Seborrheic dermatitis can also appear on the scalp as stubborn, itchy dandruff. Ringworm of the body (tinea corporis). The rash of pityriasis rosea often extends from the middle of the body, and its shape resembles drooping pine tree branches.
Seborrheic dermatitis may also affect the groin, axillae, and submammary area causing intertrigo which should be differentiated from inverse psoriasis and candidiasis. The differential diagnosis includes psoriasis, pityriasis rosea, drug reaction, lupus, and secondary syphilis. When there are few lesions, the differential diagnosis of tinea corporis, psoriasis, and Bowen’s disease (squamous cell carcinoma in situ) must be considered. Exposure to animals or contaminated soil may also cause tinea corporis. Secondary syphilis can mimic pityriasis rosea. Tepid corn starch baths (1 cup in 1/2 tub of water) may also be comforting. Other diagnostic considerations besides syphilis include tinea corporis, seborrheic dermatitis, acute psoriasis, and tinea versicolor.
Tinea corporis, tinea cruris, and tinea pedis generally respond to inexpensive topical agents such as terbinafine cream or butenafine cream, but oral antifungal agents may be indicated for extensive disease, failed topical treatment, immunocompromised patients, or severe moccasin-type tinea pedis. The clinical diagnosis can be unreliable because tinea infections have many mimics, which can manifest identical lesions. Candida (yeast) and mold, which may cause onychomycosis or coexist in a dystrophic nail. Pityriasis rosea herald patch. Pityriasis versicolor presents as asymptomatic flaky patches on the trunk, neck, and/or arms, which persist for months or years. The diagnosis of malassezia infections is generally confirmed by skin scrapings but malassezia may also be identified in apparently normal skin. The same fungus may also cause jock itch in the groin. Pityriasis Rosea. Seborrheic Dermatitis is a skin disorder that causes a red, scaly, itchy rash. Seborrheic dermatitis tends to come and go and is most common in people with oily skin or hair and may be seen with acne or psoriasis. Many skin problems, such as acne, also affect your appearance. Tags: corporis, dermatology, eczema, itchy, look-alike, mimic, numular, pityriasis, rash, rosea, tinea, viral. Neither was I. Together, we decided it was probably Tinea Corporis aka ringworm. It is possible that you had seborrheic dermatitis which can be on the trunk as well. Over a third of people with psoriasis also have an affected family member. Psoriasis may develop at any age, but most commonly begins between ages 15 and 35. It often mimics fungal infections.