Very embarrassing and could never even bring myself to tell a doctor. For years i have had a problem of excessive sweating of my buttocks. It starts at the top of the crack and goes about midway down my buttocks (it is not anal sweating rather just the crack). I used to use powder to absorb the sweat but my wife read that talcom can cause cancer. It is not constant but sometimes it is so bad that i will get up from a bench at the gym and notice it is marred with sweat. Lots of times I wake up and my boxers are sweaty. I believe it started sometime after lower back surgery years ago. Am i the only one who has this problem?
I get that too, and I found the best thing is to wear cotton underwear,
I also sprinkle all over the inside of my underwear baby power or Gold Bond Medicated Power (that stuff is GREAT). I've never mentioned it to my doctor, but next time maybe I will.
I know what you mean at the gym about leaving sweat marks, since I usually wear a jock there is nothing to absorb the sweat, thats why I always carry a small towel to wipe up whatever marks I leave.
I have sweating in the region too but, but perhaps a little differently.
I have hyperhydrosis connected with social anxiety disorder.....when I'm nervous I sweat, forehead, underarms, back, legs.
Like you I also sweat at gym, but this does not seem to be connected with the anxiety....just sitting on plastic or leather surfaces leaves a mark. From what I have seen this is quite common.
But I also sweat profusely in the buttock region when needing to poop. It stops immediately after defecation. I have spoken to a doctor about this and she said it was probably just overactive glands/hormones etc. but I was too embarrassed to convey to her the negative impact this has on my life.