Thanks for writing in.
The condition your wife is suffering for can be folliculitis
You can use Tbact cream cream over the affected area twice daily .
Also you can use a good antibacterial soap like SOAPEX soap for bathing.
Inj tricort contains steroid
which may worsen the condition and psoriasis
Better avoid the injection.
Acetret is good for psoriasis you can take it.Atarax is for itching and its safe.
Few prescription drugs and antibiotics can help a lot in cure of this problem.
Hope this helps.
I encourage you to visit a qualified dermatologist
for confirmation of diagnosis and prescription medicines.