Malva alcea common in drier soils in thickets, along paths and in waste places. Natural hybrids with the closely related "Malva moschata" are occasionally found. In central Europe it grows at altitudes of up to 2,000 m. It has been widely grown outside of its native range as an ornamental plant. Several cultivars exist such as 'Fastigata', an upright form, and 'Alba', a white flowered form. In some areas, such as the northeastern United States, the plant has escaped from cultivation and become naturalised. It is very similar to, and often confused with "Malva moschata". Malva alcea Malva alcea (greater musk-mallow, cut-leaved
Pityriasis rosea which cause roseola in infants. Experienced practitioners may make the diagnosis clinically. 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. The clinical appearance of pityriasis rosea is similar to that of secondary syphilis, and rapid plasma reagin testing should be performed if there is any clinical concern for syphilis. A biopsy of the lesions will show extravasated erythrocytes within dermal papillae and dyskeratotic cells within the dermis. A set of validated diagnostic criteria for pityriasis rosea is