Thanks for writing in.
Although what you are describing is suggestive of an infection, it could potentially represent a cancer as well. Uneven margins, scabbing, reappearing are signs I am not comfortable with. We can differentiate between the two only by a physical exam and a biopsy
of the mole. The best way forward would be for you to get it examined by your general physician and probably get a punch biopsy done by a dermatologist
Hope this helps