Lump under the skin symptoms and conditions

I started on the Acphex a couple of weeks ago and have experienced itching or prickling sensation all over my body especially my scalp and legs, on the legs I have a rash that started on the calves and is now working its way up to my thighs and buttocks the rash started out as red bumps but it dry's up and starts flaking off it looks horrible and is getting worse by the day. I am going to stop taking it to see if the symptoms clear up. Also some constipation and my athsma symptoms seem worse.