and shortly afterwards started feeling sharp pains along my inner thigh and buttock. After a few days of pains I developed a red rash with very small blisters (similar to a heat
related problem here. I would advise that you have his assessed by your doctor so that the right medications would be prescribed you. Antiviral medications should be given within the first 48 hours of the presentation of the rash . Pain medications will also be able to help alleviate the pain. Take pain relievers as necessary. Also, keep the area clean and refrain from touching affected areas unnecessarily. This will help prevent further infections.
Other differentials may be HSV type 1 skin infection. Also, dermatitis and folliculitis may be considered.