Joining the club as well. Just woke up with this weird stain.
37 female, Va, USA. I'm not going to add any female medical issues I've had, as there are obviously men with this condition as well. I have had hormonal imbalances and recently started taking 10mg every other day of DHEA to give my testosterone a little boost. I take multivitamins based on my functional medicine practitioner and my Dr's advice (they're both on the same page with getting to the root cause vs. treating symptoms). I haven't taken any new vitamins in a couple of yrs. I also had low vit d but I'm doing really well with that now. No tanners, dyes, iodine, new hygiene products, etc. Last night I did have a salad with grilled chicken from Outback, plus a couple BBQ wings with their sauce and my heart was racing from all the sodium. I drank a ton of water and felt back to normal by bed time. I haven't checked if my husband or teens (they're at work and school) have it, but my 7 yr old doesn't. I'll update if they do. I'm trying to think of anything similar to any other posters. It doesn't wash off, it does have a slight metallic smell but my taste is fine. I haven't been on a hike or done any yard work for awhile. My routine has been the same for a couple of weeks now. Oh I also have really bad seasonal allergies. But again I haven't implemented any new allergy meds. I use the same ones I've been taking for awhile. We change the filters in our HVAC system regularly, and have a unit that kills bacteria when its filtered through. I'm hoping it's nothing liver related, I've been drinking alcohol quite a bit while engaging in summer activities. Someone also mentioned something about thyroiditis or thyroidism. I did have some issues with my thyroid a couple of yrs ago, but again my last bloodwork (in May) was normal. I'm racking my brain to be as thorough as possible in case this helps anyone figure it out. It's crazy the doctors and nurses don't know what it is. I really hope we get to the bottom of this. Some posters have had it going on for years!
Oh one more thing, someone mentioned addisons disease but the orange marks like ours aren't a symptom, and I'm not struggling with the other symptoms of addisons. I actually feel really great considering some of the health issues I've had in the past. I'll update if I can think of anything else.