Hi.
Thanks for your query.
Noted your history of itching over rectal area very badly, that has spread to the body. You have been given
Prednisolone,
nystatin, betagerm,
mupirocin, oatmeal baths, antihistamines and all as mentioned.
No, this can not occur due to rectal leakage unless you have scratched with nails and have implanted the infection all over the body.
I would advise you the following:
Get the blood, stool and other tests.
Have additional treatment of medicines for worms.
Multivitamins to increase the resistance power.
Try to find out the factors that are causing these; it may be pollen in the garden nearby, molds and mildews in the house, scents, fumes, dust and anything.
Try to avoid these and you may be fine.