Vascular Skin Lesions - Differential Diagnosis Algorithm - Petechiae < 0.2 cm diameter - Purpura 0.2 - 1.0 cm diameter - Ecchymosis > 1 cm diameter Blanches with Pressure - Small, dilated superficial blood vessels • Telangiectasia Does not blanche with pressure - Erythematous or violaceous discolorations of skin due to extravasation of RBCs in dermis • Congenital - Hemangioma • Acquired - Vasculitis #Vascular #Vasculitis #SkinRash #dermatology #Differential #Diagnosis #Algorithm #causes
