I am diabetic.Developed red circular blood looking "wound" on legwhich I swollen Nurse put me on antibiotics.swelling goino down mark still there WAT CAN IT BE
Are you also on any other medication e.g Aspirin, if so. you could have had a minor knock or injury which should be no big deal.
However, as suggested by Buenchico and his "link, it could be an insect bite.
You say that you are a diabetic, would that be Type 1 or Type 2 and are you on Insulin?
I am watching cricket, but it could also be Erythema nodosum...Google it..........it is also no big deal but commoner in diabetics (I think).
Someone may come up with a link for you ;-)
Cloverjo......you may be correct but and ulcer is an ulcer and the OP describes a "red circular blood looking "wound"...which my grandma use to call a "blood blister"..........something completely different from an ulcer.........hey! but who knows?