thigh rash and fatigue

I am looking for comments and answers to a problem that has been plaguing me every some often reoccurring for about 4 years. I get a slight rash on the insides on my thighs. Sometimes it goes away quickly other times it is there for seemingly months. This usually goes hand in hand with a fatigue .I am 45yo male.The fatigue appears after sexual orggasum or after eating. Tweet