4. Senile purpura: Multiple purpuric macules

6. Idiopathic thrombocytopenic purpura: Multiple petechiae on the arm

8. Disseminated intravascular coagulation: Extensive geographic cutaneous infarction on the forearm

9. Disseminated intravascular coagulation: Extensive deep purple ecchymoses with hemorragic blister formation

11. Henoch-Schonlein purpura: Multiple palpable deep purple macules on the extensor side of lower extremities and buttocks

12. Henoch-Schonlein purpura: Small venules show fibrinoid necrosis with considerable red cell extravasation.

14. Henoch-Schonlein purpura: The DIF of IgA shows granular depositions at the papillary dermis.

16. Pityriasis lichenoides et varioliformis acuta : Multiple erythematous papules on the back and buttocks

17. Pityriasis lichenoides et varioliformis acuta : Multiple erythematous papules with necrotic and crusted lesions on the buttocks

18. Pityriasis lichenoides et varioliformis acuta : Multiple erythematous papules with necrotic and crusted lesions on the buttocks

19. Pityriasis lichenoides et varioliformis acuta : This view shows basal cell hydropic degeneration, moderate lymphohistiocytic infiltrate at the upper dermis and red cell extravasation.

20. 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.

22. Pityriasis lichenoides chronica : Multiple brownish-to-red scaly papules with and crusted lesions

24. Erythema elevatum diutinum : Multiple erythematous nodules present on the back of the hand.

25. Erythema elevatum diutinum : Multiple erythematous nodules present on the back of the hand.

26. Erythema elevatum diutinum : Multiple erythematous nodules present on the palm and fingers.

27. Erythema elevatum diutinum : Multiple erythematous nodules present on the palm and fingers.

29. Sweet’s syndrome : Erythematous, edematous plaques on the periorbital area with superficial tiny pustules.

30. Sweet’s syndrome : Erythematous, edematous plaques on the neck with pustules and crusted lesions.

31. Sweet’s syndrome : The epidermis shows subcorneal pustulation. There are diffuse mixed cell infiltrates in the dermis.

32. Sweet’s syndrome : The infiltrate consisted largely of neutrophils.

34. Polyarteritis nodosa: Several dermal and subcutaneous nodules on the back of the foot.

35. Polyarteritis nodosa: Several erythematous dermal and subcutaneous nodules with ulceration on the foot.

36. Polyarteritis nodosa: Necrotizing vasculitis is seen within the subcutaneous fat.

37. Polyarteritis nodosa: Necrotizing vasculitis is seen within the subcutaneous fat.

39. Wegener’s granulomatosis: Several erythematous-dark red ulcerating plaques and nodules on the foot.

40. Wegener’s granulomatosis: One erythematous-dark red ulcerating plaque with blister formation.

41. Wegener’s granulomatosis: Extensive necrotizing vasculitis is seen within the dermis with red cell extravasation.

42. Wegener’s granulomatosis: Close-up view shows necrotizing vasculitis with red cell extravasation.

44. Wegener’s granulomatosis: Nasal mucosa biopsy shows necrotizing vasculitis

46. Wegener’s granulomatosis: Transbronchial biopsy shows necrotizing vasculitis with extravascular granuloma formation.

47. Wegener’s granulomatosis: Chest films shows cavitation on the right upper lobs.

49. Dego’s syndrome: Small white papules with central depression and white fine scaling.

50. Dego’s syndrome: There is hyperkeratosis with epidermal atrophy

51. Dego’s syndrome: There is hyperkeratosis with epidermal atrophy with ectatic vessels.

52. Dego’s syndrome: There is hyperkeratosis with epidermal atrophy. Note the ectatic vessels.

54. Livedo reticularis: A mottled violaceous discoloration of the skin in a net-like pattern.

55. Livedo reticularis: A mottled erythematous discoloration of the skin in a net-like pattern.

57. Livedoid vasculitis: Multiple purpuric macules

59. Livedoid vasculitis: Punched-out ulcers are seen on the ankle

61. Lymphomatoid granulomatosis: Multiple erythematous macules

62. Lymphomatoid granulomatosis: Nodular to ulcerative cutaneous lesions

64. Lymphomatoid granulomatosis: Nodular lymphoid and/or granulomatous infiltration surrounding the vessels

65. Lymphomatoid granulomatosis: Nodular lymphoid infiltration surrounding the vessles

67. Purpura pigmentosa chronica: Multiple erythematous patches on the lower leg

68. Purpura pigmentosa chronica: Scaly petechial or purpuric macules

72. Acne vulgaris: Multiple erythematous papules and pustules

75. Steroid acne: Multiple erythematous papules and pustules

79. Neonatal: Multiple erythematous papules and pustules on a neonate

81. Rosacea: Swollen nose with sebaceous gland hyperplasia and fibrosis

82. Rosacea: Telangiectasia and erythema.

84. Androgenic alopecia: Alopecia with the typical M-shape pattern

87. Follicular muconosis: Acute form. Boggy plaques on the face.

89. Follicular muconosis: Mucin deposition in the follicles. Interfollicular cell infiltrate

93. Relapsing polychondritis: Erythema, swelling, and pain of the cartilaginous portion of the ear

94. Relapsing polychondritis: Loss of basophilic staining and breakdown of lacunar structure of the cartilage

96. Relapsing polychondritis: Breakdown of lacunar structure of the cartilage

98. Eosinophilic pustular folliculitis: Erythematous plaque with superimposed coalescent pustules

100. Eosinophilic pustular folliculitis: Microabscess composed of eosinophils

102. Pityrosporum folliculitis: Pruritic eryhematous papules and pustules, primarily on the back, chest, and shoulders

105. Eosinophilic cellulitis: Recurrent painful or pruiritic plaques

106. Eosinophilic cellulitis: Recurrent painful or pruiritic plaques with bullae

108. Eosinophilic cellulitis: Diffuse eosinophilic infiltrate throughout the dermis

109. Eosinophilic cellulitis: Diffuse eosinophilic infiltrate throughout the dermis. Flame figures can be seen.