I Woke Up This Morning And Found Brown And Dark

i woke up this morning and found brown and dark brown spots on my arm I have been going to the dortor and have a cold and my other arm hurts, back hurts he checked me and said tha my kidney was elevated what does that mean he put me on these meds for pain and cramps in my legs hydroco/apap/sulindac and tizanidine and benzonatate for cough plus an antibotic called azithromycin and I take robitussin DM, theraflu, and mucus Relief plus my regular meds for diabetic, and high blood pressure and vit. D and iron pill