my friend is on antibiotics for left lower leg, below knee, very swollen, then, very strangely- indented back in from swelling about midway down to ankle. The indented area is very red, deep red. She said a Doppler US was negative. Doesn t know if she s a diabetic but said they ran some blood tests. Does this sound like typical cellulitis? She doesn t remember hurting her leg or ankle. I m a nurse and never saw anything quite like this where the swelling just suddenly indents in at the redness part of lower leg.