Please help in diagnosis and treatment of 31 yrs old female

Hello everyone

Please help in diagnosis and treatment of 31 yrs old female.

The lesion start at one corner of foot 7 days back and now spread on entire right foot and also on the posterior aspect of left leg. The patient has severe itching which aggravate at night. Plz help. She has no history of allergy, systemic disease, DM, HTN.