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Primary lesions
term | definition | examples |
---|---|---|
macule | skin color change without elevation (flat | freckles or petechia; described as a patch if greater than 1 cm (vitiligo) |
papule | elevated, solid lesion of less than 1 cm, varying in color | warts or elevated nevus |
plaque | raised, flat lesion fromed from merging papules or nodules | (blank) |
nodule | larger than a papule. Raised solid lesion extending deeper into the dermis. A large nodule is referred to as a tumor | (blank) |
wheal | fleeting skin elevation that is irregularly shaped because of edema | mosquito bite or urticaria |
vesicle | elevated, sharply defined lesion containing serous fluid. Usually less than 1 cm | blister, chickenpox, or herpes simplex |
bulla (pl. bullae) | large,elevated, fluid filled lesion greater than 1 cm | partial thickness burn |
cyst | elevated, thick walled lesion containing fluid or semi-solid matter | (blank) |
pustule | elevated lesion less than 1 cm containing purulent material. lesion larger than 1 cm described as boils, abscesses, or furuncles | acne pr impetigo |