Overview Terminology Used to Describe Skin LesionsTermDescriptionPhotoRash/eruptionDescribes more widespread skin involvement, which can be composed of several lesions with primary and secondary morphologiese.g.,chicken poxMaculeFlat lesion < 1 cm in diametere.g.,frecklesPatchFlat lesion > 1 cm in diametere.g.,cafe-au-lait spotPapuleElevated lesion that is < 1 cm in diameterPalpable lesione.g.,acnePlaqueElevated lesion that is > 1 cm diameterPalpablePalpablePapules andPlaquese.g.,plaque psoriasisNodulePalpable, solid, and round or ellipsoidal lesion of dermal origine.g., erythema nodosumVesicleSmall fluid containing lesion that is < 0.5 cme.g.,zosterPustuleVesicle containing purulent materialMay be white or yellowIs not always infected (e.g. sterile pustule)e.g.,pustular psoriasisWhealEdematous papule or plaque caused by swelling in the dermise.g.,urticariaBullaLarge fluid containing lesion that is > 0.5 cmCan be multi-loculatede.g.,bullous pemphigoidCystClosed epithelial-lined cavity or sac containing liquid or semi-solid materialFluctuant as it contains liquide.g.,epidermal inclusion cystPurpuraNon-palpable purpurapetechiae (< 3 mm)ecchymoses (> 5 mm)Palpable purpuraIndicates extravasation of red blood cells into the skine.g.,small vessel vasculitisPetechiaeSmall red, purple, or brown pinpoint dots indicative of hemorrhageNon-blanchinge.g.,thrombocytopeniaEcchymosesPurple or brown lesions covering a larger areaNon-blanchinge.g.,traumatic bruiseLichenificationAccentuated skin markings in thick epidermis due to scratchinge.g.,atopic dermatitisKeloidIrregular plaque-like lesion resulting from abnormal healing and extends beyond the borders of initial woundHyperkeratosisIncreased thickness of stratum corneum seen in chronic dermatitise.g.,callusesParakeratosisHyperkeratosis with retention of nuclei in stratum corneum and thinning of stratum granulosume.g.,classic finding in psoriasisAnnularRing shaped lesione.g.,ringworm infection