HCM is your perfect choice.
Your skin condition might be..
1. Erythema nodosum
2. Lichen simplex chronicus
3. Hypertrophic lichen planus or
4. Due to venous insufficiency..
But i think it most likely due to a chronic venous insufficiency
on that condition you could try the following.
1. Use a moderate potency steroid (like betnovate ointment twice daily) for 2 weeks
2. U must loose your weight
3. Wear a tight stocking
4. lift your leg side up during sleep.
Consult with a dietitian and a dermatologist
1 month later.