54 yo AAM is seen in the IM clinic for the skin color changes of 1 month duration in the right elbow area. No associated Itching is present. Skin findings are noted as below. What is the DDx, and How do you manage this patient? 

55 yo F patient with DM (A1C 9.5) is seen the IM clinic as a same day patient for the complaint of spider bite. Patient did not notice the kind of spider but is quiet sure about it.  It happened 3 days back. Since, this morning redness is spreading. What is the DDx and how do you manage the patient.