Kind of investigation you want is possible with a doctor personally examining you....blood ,urine investigations is basic and is done as a preliminary baseline investigation.but for diagnosing skin infections one needs to see a doctor personally
Next Steps
for now you may have lab investigations like
COMPLETE BLOOD COUNT ,
LIVER FUNCTION TEST AND RENAL FUNCTION TEST
LIPID PROFILING , SERUM ELECTROLYTE ,ESR PTT INR TEST, URINE AND STOOL EXAMINATION.