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Senile purpura: Multiple purpuric macules
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Idiopathic thrombocytopenic purpura: Multiple petechiae on the arm
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Disseminated intravascular coagulation: Extensive geographic cutaneous infarction on the forearm
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Disseminated intravascular coagulation: Extensive deep purple ecchymoses with hemorragic blister formation
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Henoch-Schonlein purpura: Multiple palpable deep purple macules on the extensor side of lower extremities and buttocks
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Henoch-Schonlein purpura: Small venules show fibrinoid necrosis with considerable red cell extravasation.
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Henoch-Schonlein purpura: The DIF of IgA shows granular depositions at the papillary dermis.
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Pityriasis lichenoides et varioliformis acuta : Multiple erythematous papules on the back and buttocks
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Pityriasis lichenoides et varioliformis acuta : Multiple erythematous papules with necrotic and crusted lesions on the buttocks
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Pityriasis lichenoides et varioliformis acuta : Multiple erythematous papules with necrotic and crusted lesions on the buttocks
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Pityriasis lichenoides et varioliformis acuta : This view shows basal cell hydropic degeneration, moderate lymphohistiocytic infiltrate at the upper dermis and red cell extravasation.
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Pityriasis lichenoides et varioliformis acuta : This view shows mild spongiosis, basal cell hydropic degeneration, moderate lymphohistiocytic infiltrate at the upper dermis and red cell extravasation.
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Pityriasis lichenoides chronica : Multiple brownish-to-red scaly papules with and crusted lesions
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Erythema elevatum diutinum : Multiple erythematous nodules present on the back of the hand.
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Erythema elevatum diutinum : Multiple erythematous nodules present on the back of the hand.
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Erythema elevatum diutinum : Multiple erythematous nodules present on the palm and fingers.
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Erythema elevatum diutinum : Multiple erythematous nodules present on the palm and fingers.
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Sweet’s syndrome : Erythematous, edematous plaques on the periorbital area with superficial tiny pustules.
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Sweet’s syndrome : Erythematous, edematous plaques on the neck with pustules and crusted lesions.
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Sweet’s syndrome : The epidermis shows subcorneal pustulation. There are diffuse mixed cell infiltrates in the dermis.
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Sweet’s syndrome : The infiltrate consisted largely of neutrophils.
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Polyarteritis nodosa: Several dermal and subcutaneous nodules on the back of the foot.
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Polyarteritis nodosa: Several erythematous dermal and subcutaneous nodules with ulceration on the foot.
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Polyarteritis nodosa: Necrotizing vasculitis is seen within the subcutaneous fat.
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Polyarteritis nodosa: Necrotizing vasculitis is seen within the subcutaneous fat.
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Wegener’s granulomatosis: Several erythematous-dark red ulcerating plaques and nodules on the foot.
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Wegener’s granulomatosis: One erythematous-dark red ulcerating plaque with blister formation.
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Wegener’s granulomatosis: Extensive necrotizing vasculitis is seen within the dermis with red cell extravasation.
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Wegener’s granulomatosis: Close-up view shows necrotizing vasculitis with red cell extravasation.
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Wegener’s granulomatosis: Nasal mucosa biopsy shows necrotizing vasculitis
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Wegener’s granulomatosis: Transbronchial biopsy shows necrotizing vasculitis with extravascular granuloma formation.
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Wegener’s granulomatosis: Chest films shows cavitation on the right upper lobs.
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Dego’s syndrome: Small white papules with central depression and white fine scaling.
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Dego’s syndrome: There is hyperkeratosis with epidermal atrophy
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Dego’s syndrome: There is hyperkeratosis with epidermal atrophy with ectatic vessels.
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Dego’s syndrome: There is hyperkeratosis with epidermal atrophy. Note the ectatic vessels.
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Livedo reticularis: A mottled violaceous discoloration of the skin in a net-like pattern.
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Livedo reticularis: A mottled erythematous discoloration of the skin in a net-like pattern.
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Livedoid vasculitis: Multiple purpuric macules
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Livedoid vasculitis: Punched-out ulcers are seen on the ankle
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Lymphomatoid granulomatosis: Multiple erythematous macules
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Lymphomatoid granulomatosis: Nodular to ulcerative cutaneous lesions
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Lymphomatoid granulomatosis: Nodular lymphoid and/or granulomatous infiltration surrounding the vessels
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Lymphomatoid granulomatosis: Nodular lymphoid infiltration surrounding the vessles
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Purpura pigmentosa chronica: Multiple erythematous patches on the lower leg
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Purpura pigmentosa chronica: Scaly petechial or purpuric macules
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Acne vulgaris: Multiple erythematous papules and pustules
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Steroid acne: Multiple erythematous papules and pustules
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Neonatal: Multiple erythematous papules and pustules on a neonate
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Rosacea: Swollen nose with sebaceous gland hyperplasia and fibrosis
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Rosacea: Telangiectasia and erythema.
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Androgenic alopecia: Alopecia with the typical M-shape pattern
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Follicular muconosis: Acute form. Boggy plaques on the face.
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Follicular muconosis: Mucin deposition in the follicles. Interfollicular cell infiltrate
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Relapsing polychondritis: Erythema, swelling, and pain of the cartilaginous portion of the ear
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Relapsing polychondritis: Loss of basophilic staining and breakdown of lacunar structure of the cartilage
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Relapsing polychondritis: Breakdown of lacunar structure of the cartilage
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Eosinophilic pustular folliculitis: Erythematous plaque with superimposed coalescent pustules
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Eosinophilic pustular folliculitis: Microabscess composed of eosinophils
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Pityrosporum folliculitis: Pruritic eryhematous papules and pustules, primarily on the back, chest, and shoulders
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Eosinophilic cellulitis: Recurrent painful or pruiritic plaques
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Eosinophilic cellulitis: Recurrent painful or pruiritic plaques with bullae
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Eosinophilic cellulitis: Diffuse eosinophilic infiltrate throughout the dermis
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Eosinophilic cellulitis: Diffuse eosinophilic infiltrate throughout the dermis. Flame figures can be seen.
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