Hi there Ambuj. Thank you for posting your question with Healthcaremagic. I will do my best to help you.
This may be stasis dermatitis
due to a varicose
vain problem. When sitting, keep your legs up. Get some Hydro-cortisone
0.5% cream and apply to rash
. If you have varicose problem have this seen to also. Thank you.
I hope that I have answered your questions fully and been of some help. If you have anymore questions please contact me again anytime.
Dr Andrew Rynne.