No, you didn't have a risk of contracting HIV from a receptive blowjob and you had protected sex. If you have a concern about your rash see your dermatologist.
Man I dont have the courage to be tested. I'd love to if I were able.
Here's a picture of my forehead:
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You do not need a test. The chance of getting HIV from receiving oral sex is only theoretical. There has never been one documented transmission of someone contracting HIV from getting a blowjob. It does not matter what your rash looks like - you were never at risk for HIV from the situations you have described here.
The rash can be alergic, fungus, ect. go to a dermatologist.