question: I have non-healing  round and oval shaped lesions/ulcerations on my neck for almost a year now.  A couple of them went away, but then new ones appeared; the tissue feels lumpy underneath.  They get covered by scabs, but do not heal.   Antibiotics and topical clindamycin seemed to help a little, but not much improvement had been observed.  When a skin sample was attempted to be cultured, no single specific bacteria was found. What can it be?? Please help!