• Alopecia
• Acniform eruptions
• Benign tumors
• Bullous diseases
• Dermoscopy
• Nevi, melanoma
• Nonmelanoma cancer
• Psoriasis and others
• Stds
• Vascular tumors
• Vulvar disease

• Psoriasis
• Psoriasis Introduction
• Psoriasis Approach to the Patient
• Chronic Plaque Psoriasis
• Guttate Psoriasis
• Localized Pustular Psoriasis
• Inverse Psoriasis
• Generalized Pustular Psoriasis
• Nail Psoriasis
• Psoriasis Treatment Topical Therapy
• Psoriasis Treatment Phototherapy
• Psoriasis Treatment Systemic Therapy
• Psoriasis Biologic Therapy
• Seborrheic dermatitis
• Seborrheic Dermatitis Introduction
• Seborrheic Dermatitis in Adults
• Seborrheic Dermatitis in Infants
• Seborrheic Dermatitis Treatment and Dandruff Treatment
• Pityriasis rosea
• Pityriasis Rosea Introduction
• Pityriasis Rosea Skin Findings and Clinical Course
• Pityriasis Rosea Treatment
• Lichen planus
• Lichen Planus Introduction
• Cutaneous Lichen Planus
• Mucosal Lichen Planus
• Nail Lichen Planus
• Lichen planus Treatment
• Lichen sclerosus
• Lichen Sclerosus Introduction
• Lichen sclerosis Skin Findings
• Lichen Sclerosus Mucosal Findings
• Lichen Sclerosus Treatment

Pityriasis Rosea Introduction

Pityriasis Rosea is a common, self-limited, usually asymptomatic, clinically distinctive papulosquamous eruption. More than 75% of patients are between 10 and 35 years of age. Many patients report a mild prodrome or upper respiratory illness within a month of onset.

The onset and clinical course are quite distinctive. The first lesion or herald patch appears, most often on the trunk. The lesion is an oval plaque of 1 to 3 cm in diameter, which develops a thin collarette of residual scale inside the border. 1 to 2 weeks later numerous similar but smaller lesions begin to appear and reach a maximum number within 2 weeks while the herald patch is still present. Lesions usually clear spontaneously in 4 to 12 weeks, without scarring, although postinflammatory pigmentary changes may take months to resolve in darker-skinned people.

Seasonal cases in the spring and fall within the community suggest a viral etiology, though this has not been confirmed. Limited outbreaks have occurred in close quarters such as fraternity houses and military barracks.