A short course of cortisone cream, your doc can prescribe a stronger one that OTC.
Plus you need to keep the area very clean and dry. Try warm baths one or two times a day, then blot dry and blow dry with warm not hot hair dryer. You just need enough water to sit in and only use baby wash for soap. When you go don't wipe. Rinse clean with warm water in a squirt bottle then blot dry and the hair dryer. I've been brought to tears with pain there, and have learned that gentle cleaning, staying dry, and a very light barrier (I use a tiny bit of petroleum jelly) is worth the extra effort.