Hello, this is Dr. Love.
Could you attach pictures of the rash?
I am sorry for the delay, but the moderator that asked if you had found the answer also asked other experts to assist you and I asked if you could attach a picture of the rash.
No pictures have come through the system. Did you use the icon on the toolbar that looks like a paper clip?
The pictures came through this time.
This does look like there is blood collecting under the skin along with a rash. The most common reason for this in this location is a fungal infection of the skin which is then scratched or rubbed to cause the blood collection under the skin. Even if you are not scratching or rubbing the area while awake, you may be doing so while asleep.
A definitive diagnosis can be done by your doctor scraping the skin and performing a microscopic examination. However, another option that you can do at home would be a trial of an ove the counter antifungal medicine, such as clotrimazole.