1. MORPHOLOGY Primary Lesions Secondary Lesions Special Lesions

2. Primary Lesions

3. Macule Flat discoloration (any color) up to 1 cm

4. Patch Flat discoloration (any color) greater than 1 cm

5. Papule Palpable lesion up to 1 cm May become confluent to form plaque

6. Plaque Palpable lesion greater than 1 cm

7. Nodule Circumscribed, elevated, solid lesion greater than 1 cm

8. Tumor A very large nodule

9. Vesicle Circumscribed collection of free fluid up to 1 cm

10. Pustule Circumscribed collection of pus up to 1 cm

11. Bullae Circumscribed collection of free fluid greater than 1 cm

12. Wheal (hive) Firm, edematous plaque resulting from infiltration of the dermis with fluids Transient; may last only a few hours

13. Secondary Lesions

14. Scales Excess dead epidermal cells that are produced by an abnormal keratinization and shedding

15. Crust Collection of dried serum and cellular debris (a scab)

16. Erosion Focal loss of epidermis Does not pass the dermoepidermal junction Heals without scarring

17. Ulcer Focal loss of epidermis and dermis Heals with scarring

18. Fissure Linear loss of epidermis and dermis with sharply defined nearly vertical walls

19. Atrophy Depression in the skin resulting from thinning of the epidermis or dermis

20. Scar Abnormal formation of connective tissue implying dermal damage; After injury or surgery scars are initially thick and pink but with time become white and atrophic

21. Special skin lesions

22. Comedone Plug of sebaceous and keratinous material lodged in the opening of a hail follicle Closed comedone = white head Open comedone = black head

23. Excoriation An erosion caused by scratching; often linear

24. Lichenification Area of thickened epidermis induced by scratching Skin lines are accentuated so that the surface looks like tree-barking

25. Petechiae Circumscribed tiny deposit of blood (up to 0.5 cm)

26. Purpura Circumscribed deposit of blood greater than 0.5 cm

27. Ecchymoses Very large purpuric lesions

28. Name that lesion! Use the proper terminology to describe the predominant lesion (primary, secondary or special) shown in the following photos.

29. Macules

30. Papules

31. Pustules

32. Nodule

33. Patch

34. Tumor

35. Vesicles

37. Scales

38. Crust

39. Patches

40. Erosion

41. Fissures

42. Atrophy

43. Lichenification

44. Comedones

45. Erosion & Crust

46. Bullae

47. Papules

48. Fissures

49. Plaques

50. Lichenification