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A 70 year old previously well female presents with a palpable breast mass. On clinical exam, she has a palpable, fixed and firm 4 by 4 lesion in the right upper outer quadrant, as well as peau d'orange. She undergoes mammography and core biopsy and is subsequently diagnosed with invasive ductal carcinoma. She wants to undergo mastectomy. What is the physiologic cause of peau d'orange?