I am fairly certain all this is being caused by an allergic reaction and hence it is very important you make an appointment with a dermatologist ASAP.
Your rash now sounds like an infected eczema and I suggest you see your GP and take a 10 day course of flucloxacillin tablets to treat the infection. Have you started the steroid cream I suggested? That would also help.
Once you have the allergy testing, you will have all your answers. The new rash now is probably due to secondary infection
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