The Prudendal nerve may be effected due to RSD,,The nerve runs down the lower spine in the middle of the buttocks into the prudendal canal then into the perineum. It will mimmic PNE prudenal nerve entrament,,includeing rash on buttocks ,inner theigh,private area,,pernineum area ,pain,cramping and private area[both male and female] areas,,,,, also burning,sizling,coldness in legs ,feet and buttocks,,can effect the bladder,, problems urinating and constipation and trouble passing stool. it can mimic prostate problems,,pain can be aggravated by sitting and not always reliefed by lying down,standing can bring relief but not always[20%]. ,,I just learned about it,,nerves are nerves,and RSD likes them,,this is not an fully exhausted symptom list,,,It is very hard to diagnose,it mimmics alot of different conditions as you will find when you google it,,,,