Hello,
This kind of red rash can be due to contact dermatitis, stasis dermatitis, hypertrophic lichen planus or fungal infection( usually it is itchy). I suggest you to get an evaluation done from a dermatologist. Till then keep your leg elevated while sitting and apply some calamine lotion of the rash.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
Also I found someone elses question and it words it describes what I have too
I seem to have freckle size red spots all down the front of my legs and now the tops of my feet. They appear like little blood spots. There is no itch.
Thats the way it started out for me, just little freckles. Now they are scabbing.