Potent class I steroids (like those listed in the heading) 'must' be tapered down and not dropped cold turkey, else you may have what is called a 'rebound' effect that can leave you much worse off than the original problem. Too much can be very damaging to the tissue as it can thin the tissue in a fairly short amount of time and give you the same or even worse symptoms than you're trying to correct. One study shows that thinning effect after only 3 days use of clobetasol (microscopically). I mention that only to show you it’s a potent medication and to not overuse it, but I do not want you to be frightened of it either.
Steroids are wonderful and can be a godsend no doubt, so please don't be afraid of them, just be aware. Generally within 2 -3 weeks you 'should' be seeing 'some' benefits. If not or if you are even worse, I'd definitely taper down and NOT use more; MORE is NOT better with a steroid! I cannot stress this enough - it's a very potent medicine, but used correctly can be a godsend.