An important pointer on making skin incisions.
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“When making skin incisions or excising masses or wounds, always orient the long axis of the incision or ellipse along (i.e. parallele to) the line of skin tension.”
-Giselle Hosgood, DVM, BVSc, MS, PhD, FACVSc, DACVS
From Practical Matters: Find the direction of skin tension when making skin incisions