I would be pleased to answer your question
The possibilities for below knee lesions include: Schamberg's purpura
, venous eczemas , Contact dermatitis
, eczematized pigmented purpuras.
You will need to apply over the counter cortaid cream on the affected area twice a day for 10 days . If it does not improve with the treatment you will need to show a Dermatologist
to rule out one of the above .
Thanks and Take care