 [ Symptoms ] red bumps then swelling turned in to blistering [ Disease ] in my opinion it is allergic eczema apply a nonprescription steroid cream hydrocortisone along with anti itching lotion mentholcamphor such as calamine the cream must be applied as often as possible without skipping days until the rash is gone diphenhydramine benadryl in pill form may be taken for the itching caution – you should not take this medication if you need to drive a car or operate machinery as it will make you sleepy clean the area with a hypoallergenic soap every day apply lubricating cream or lotion after washing