I had a reaction to cashews which caused a skin rash (per my dermatologist) similar to a poison ivy rash.  It was a very severe rash, covered most of my body.  I was on prednisone for a month which cleared up the rash but now that I have been off the predisone for 1 & 1/2 months I am getting some reoccurance of the rash, especially in areas where my skins rubs (under the arms, around the waist line) and especially after running or biking.  Is it normal to still have the rash (or flare ups) and is it still working its way out of my system after this length of time ?  The rash started the beginning of April and I stopped the prednisone at the end of April.
Rashes may reappear by the same cause or some other factors too. You can't take prednisolone every time. It won't be good. If I tell taking some simple natural ways to get rid of these? Do not take it lightly. It had the potential to manage toughest of allergies. Take Turmeric and Need leaves powder equally. Need is Azadirachta indica. Mix some sugar candy powder if not diabetic. Mix well. Use of this 1 tsp TDS will wonderful results without any bad effects. You can get Cap Hard Chat Doctor.  It's commonly available in India. Elsewhere, find on net. Hope it helps. For rubbing site problems apply some coconut oil regularly.