Body lice can be treated effectively by a dermatologist or a family physician.
It just requires a single application of the medicine.
They will also educate you how to prevent recurrences.
Other members of the family or the hostel mates need to be treated.
Next Steps
You can meet a qualified Dermatologist with MD/DNB/DDVL/DVD degree for proper examination.
Health Tips
You can consult me online for personal recommendations.