Annular Skin Lesions Flashcards
Arcuate lesions
arc shaped lesions that represent incompletely formed annular lesions
Polycyclic lesion
multiple coalesing arcuate or annular lesions
Atypical target
only two zones of color change
Target
Dusky red center then a zone of pallor then a peripheral erythematous ring
Patient assessment of annular lesions includes
What are the physical characteristics of the lesions? Are they stationary, expanding or migratory? Where are they located? A/w any systemic or cutaneous s.s?
Annular skin lesion color
Inflamatory process is erythematous that is blanchable. Acute is more bright red.
Urticaria
Annular, erythematous, plaques. pink from dermal edema and vascular dilation.
Granuloma annulare
annular plaques that are muted less bright red lesions representing a condition for months to years. No scale, firm to palpation.
Erythema multiforme
Target lesions, more dusky, bulae present in the center
Annular lesion scale
Leading or trailing, leading is on the edge while trailing is in the center. Leading: dermatophyte infection tinea corporis - see picture. Trailing: pityriasis rosacea and superficial erythema annulare centrifugum
Pityriasis rosacea
numerous oval erythematous thin plaques on trunk and extremities. Christmas tree like on the back. Collarette scale. herald patch on 50 percent or more patients on the back.
Superficial erythema annulare centrifugum
inflammatory reactive disorder in superficial and deep forms. Single or multiple annular plaques on face, trunk, neck or extremities. Superficial has a trailing scale. In deep there is no scale. Cause is unknown. Infection or medications could trigger this.
Linear igA dermatosis
autoimmune subepidermal blistering disorder triggered by meds like Vanco. Annular clusters of vesicles and firm bullae in a string of jewels formation. Can be idiopathic or drug induced.
subcorneal pustular dermatosis
flaccid pustules coalescing into annular polycyclic configurations. Abdomen and skin flexures are common sites.
Purpura annularis telangiectodes of Majocchi
Symmetric asymptomatic eruptions of pinpoint nonblanchable red to brown red macules coalese to form annular patches usually on lower extremities
acute hemorrhagic edema of infancy
Benign small vessel vasculitis w edematous uticarial plaque progressing to purpuric plaque w target appearance Head, genitals, extremities . Children under 2. Possible fever but nontoxic.
henoch schonlein purpura
iga mediated small vessel vasculitis, dependent areas. systemic renal failure can occur. palpable purpura symmetrical
traumatic purpura
trauma leading to annular purpuric lesions on the skin, ex being paintball.
