Skin allergy keeps increasing.

I had small red spots on my skin and there were only on arms and foot. They were few so initially I ignored them because they used to heal itself but now from last two weeks they came back and keep increasing so i visited a local doctor and he advised to get a cbc and tec test. My tec came 558 and then he prescribed me 3 medicines. 1. Defcort 6mg 2. Allegra 180 and 3. Montair LC The moment i took 2st dose of defcort within 10 minutes my hand my legs my back was full of red rashes and then I consulted back to the doc immediately he advised not to take any more defcort and keep taking other 2 for 10 days. Its 3rd of taking my medicines but these red hives are still there all over my body and I see that they have increased not decreased. I want to have a good opinion from your experience like normally how much time it will take to see the effects of these medicines. Thank you in advance