L.—pityriasis Rosea

Pityriasis Rosea: Some Common Errors in Diagnosis with a Brief Review Stressing the Differential Diagnosis

“…According to Percival 1 the herald plaque has been observed in from 12 to 94 per cent of cases; Weiss et al 8 found it in 27 per cent, and we have noted its presence in 74 per cent of our cases. The herald plaque appears most commonly on the trunk.…”

“…In the minority, itching may be so mild that the patient does not complain of it unless asked, but the itching may range from mild to severe. Weiss et al 8 noted pruritus in 26.8 per cent of cases while we observed it in 35 per cent of our series. The most severe pruritus occurs in the urticarial type of pityriasis rosea.…”

Atypical Pityriasis Rosea: Report of Two Cases and Review of the Literature

“…19 The course of pityriasis rosea is variable. The usual duration is 5 to 8 weeks, but the lesions on the palms and soles take more time to heal, 10 as evidenced by our observations, and do not respond well to the usual treatment. Because of the unknown etiology, various modalities have been tried on an empirical basis and include tar lotions, sulfur baths, and salicylic acid.…”

Vesicular pityriasis rosea: response to erythromycin treatment

“…Weiss et al . reported only 0.5% of vesicular PR out of a total of 380 PR cases studied so far 6 . Vesicular PR is observed more frequently among children and young adults, as for most atypical forms.…”

“…Furthermore, the vesicles are usually associated with typical papulosquamous lesions, favouring a diagnosis of vesicular PR. 6,9,10 In general, the evolving course of atypical PR variants is not distinct from that of typical PR forms. 2 Histological features can be either subacute or chronic dermatitis with focal parakeratoses, mild acantosis, spongiosis and mononuclear infiltrate on the superior dermis.…”