I Have Been Dealing With A Rash That Is Presumed

I have been dealing with a rash that is presumed to be an allergic reaction to two new medications I took for 10 days and after the ten days the rash appeared. I've been taking Benadryl for 48 hours, 2 every 4 hours, and it does help the itching. The rash has spread during these 48 hours and it has spread onto my aerola. Is that dangerous?