It went away while I was sleeping that night. Over a matter of 3 hours it came to a circular blister and started to lighten in color a bit. When I got up in the morning it was gone with no proof of it being there, not even a brown discolored spot or a bruise. I might have poked it with something and didn't realize it.
Hello,
It could have been due to some trauma to the skin, pupuric spot or a hematoma under the skin. Purpura is a red or purple discoloration on the skin that does not blanch on pressure. It should go away on its own, but if it persists or grows in size then a dermatologist’s evaluation is required.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.