Hi Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concern... There can be muliple reasons for itchy sores on legs & tireness. One reason may be Diabetes as you think. High blood glucose level increases chances of bacterial infection & even small injuries & bruises Can causes itchy sores. Second reason may be fungal infection. Also fungal infection is also a possibitity if you have diabetes. Itchy sores may be linked tocontact with allergic or poisonous agent found in herbs like poison oak or ivy, or present in the insect’s sting or animal’s bite. Anti allergic medicament can be tried such as benedryl, cetrizine. Psoriasis, impetigo and eczema are few of the diseases that are known to produce rashes or skin eruption. Refer to a physician hope this information helps Good luck