Arthur, 34 years old, Highly inflammatory scales

It was psoriasis.

Let’s rule out differential diagnoses:

• Pityriasis Rosea Gibert:

Rash often limited to the trunk +- roots of the limbs: “Christmas tree” pattern with a medallion.

Viral: spontaneously heals within 6 to 8 weeks.

• Seborrhoeic dermatitis:

Location of the sebaceous areas: scalp, eyebrows, nostrils, ears, sternum, greasy scales, dandruff.

But the two can be combined: borderline types!

• Contact eczema:

Location related to an allergen, +- vesicular, and more pruritic, more difficult when chronic or nummular.

It was psoriasis.

Let’s rule out differential diagnoses:

• Pityriasis Rosea Gibert:

Rash often limited to the trunk +- roots of the limbs: “Christmas tree” pattern with a medallion.

Viral: spontaneously heals within 6 to 8 weeks.

• Seborrhoeic dermatitis:

Location of the sebaceous areas: scalp, eyebrows, nostrils, ears, sternum, greasy scales, dandruff.

But the two can be combined: borderline types!

• Contact eczema:

Location related to an allergen, +- vesicular, and more pruritic, more difficult when chronic or nummular.

It was psoriasis.

Let’s rule out differential diagnoses:

• Pityriasis Rosea Gibert:

Rash often limited to the trunk +- roots of the limbs: “Christmas tree” pattern with a medallion.

Viral: spontaneously heals within 6 to 8 weeks.

• Seborrhoeic dermatitis:

Location of the sebaceous areas: scalp, eyebrows, nostrils, ears, sternum, greasy scales, dandruff.

But the two can be combined: borderline types!

• Contact eczema:

Location related to an allergen, +- vesicular, and more pruritic, more difficult when chronic or nummular.

It is indeed psoriasis.

Let’s rule out differential diagnoses:

• Pityriasis Rosea Gibert:

Rash often limited to the trunk +- roots of the limbs: “Christmas tree” pattern with a medallion.

Viral: spontaneously heals within 6 to 8 weeks.

• Seborrhoeic dermatitis:

Location of the sebaceous areas: scalp, eyebrows, nostrils, ears, sternum, greasy scales, dandruff.

But the two can be combined: borderline types!

• Contact eczema:

Location related to an allergen, +- vesicular, and more pruritic, more difficult when chronic or nummular.