The rash from HIV infection usually occurs a couple weeks after infection. It is usually flat red spots that are all over the body- not just in one area above your collar bone as you describe.
It also is usually associated with fevers, headaches and enlarged/ tender lymph nodes in the neck and elsewhere.
If you have had a high risk unprotected sexual exposure, you should be tested- but your description is not likely to be a primary HIV infection rash.
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