It could be Scabies
Please use Tetmosol soap for bath, if it is available there.
Instead of prednisone
,take Antihistamine like Levocetrizine for itching.
Permethrin 5% cream should be applied all over the body.
You should keep your towel,dress separately.It is better if all of your family members use the lotion/cream.
Please follow the above treatment and consult your Skin specialist .
Wish you speedy recovery