What is the most likely diagnosis to consider?
A patient with diabetes has right anterior shin edema, erythema, warmth, and tenderness to touch. This developed over the past 3 days. There is no visible pus. What is the most likely diagnosis to consider?
Deep vein thrombosis (DVT)
This description is one of cellulitis. Cellulitis involves an infection of the subcutaneous layers of the skin. It must be treated with an oral antibiotic. In a patient with diabetes, it is particularly important to identify, and aggressively treat cellulitis early, because elevated blood sugar levels will make eradication more difficult. Buerger’s disease involves inflammation of the medium-sized arteries and does not present on the anterior shin only. DVT seldom presents on the anterior shin, so this is not likely. Venous disease does not present acutely, as in this situation.
An example of a first-generation cephalosporin used to treat a skin infection is:
Two common first-generation cephalosporins used to treat skin and skin structure infections are cephalexin and cefadroxil. These are taken two to four times daily and are generally well tolerated. These antibiotics provide coverage against Staphylococcus and Streptococcus, common skin pathogens.
A patient reports that he found a tick on himself about 2 weeks ago. He presents today with a red circle and a white center near where he remembers the tick bite. He did not seek treatment at that time. Today he complains of myalgias and arthralgias. Which laboratory test can be used to help diagnose Lyme disease?