What Causes Mottled Skin After Antibiotic Treatment To Cellulitis?

I am an active 69 year old female who has :Parkinson disease which is fairly controlled. I have undergone a unilateral deap brain stimulation implant on the right side to control left sided symptoms. Prior to that I began hallucinating (bugs were biting me )--this was corrected by med change.But associated with this incident,my internisrt did confirm that I had been bitten by some type of insect and I developed supposedly developed "cellulitis"An antibiotic was ordered and I then developed a C diff bacterial infection which was difficult to treat---huge doses of vancomyosin.Had one relapse and shortly thIereafter I had the DBS surgery. Now I have developed mottled skin throughout my lower extremities,wiith no vascular type pain. What could the cause be? tI know this history souonds grusome but prior to that, I was active and an avid tennis player with no health problems. Thanks for your consideration.

Jennie