As Teak has stated, you rash does NOT present a rash observed during ARS. If you have had UNPROTECTED SEX with a partner of unknown HIV status, you should obtain an HIV Antibody test 3 months after the episode. Nothing you are experiencing is in any way indicative or specific to HIV.
-JC-
No that is not an ARS rash.
What was the risk you're concerned over?
-JC-