31 years old man presented for the first time with this rash | Figure 1

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31 years old man presented for the first time with this rash started on upper chest 2 weeks back and then progress on the back down to gluteal area itchy and painful now of the side of the face Nil in the mouth nil past medical history back rash very painful said he can not sleep on it he was in anabolic steroid injection and #Testosterone injection he was on the injections while he got the rash stopped 4 days after he had the rash he is afebrile ,Blood pressure 115/65 ,PR 78. any ideas what this rash could be and what is the best treatment apart from antihistamine