Hello, thanks for using Health Care Magic.
An abrasion is a cut or wearing injury
inflicted through friction. If that is the actual cause of what you are describing then it is possible that the lesion is infected with bacteria producing the characteristic symptoms you are describing. Swelling and pain are as a result of the inflammatory process going on in a bit to control the infection.
Without abrasion it is also possible to have a skin infection
which could present with ulcerative lesions there by producing the pain and bleeding you are complaining of.
What you should do is cleaning with an antiseptic like chlorexhidine twice daily, apply an antibiotic cream ( neomycin
say) for a week but however the better option will be to see a doctor for proper examination and appropriate prescription.
Dr. Achuo A. M.