It looks pretty red around the area of the circle...have you been itching? Look up ringworm...
See your doctor and get a prescription...it is a fungal infection that you can treat with topical cream.
I'm not saying I know for sure that's what it is....but that's the first thing that came to mind when looking at your pic.
I know I dont know what it is but I am almost sure its not ringworm anyways its not itchhy its just hot outside
I would also say ringworm. My son has had ringworm and his did not itch at all. They do change in size and color. It would not hurt to get some anti-fungal cream and apply. Are they rougher around the edges?????? let me know how it goes....Michelle
It this hurting you at all?
The reason i ask this is it could simply be a form of eczma, or simply skin pigimentation..
Eczma can change and feel diff on your skin.
Skin pigementation is what i had on my arm, it didnt change much in colour just went more rough then turned a tad lighter than usual..
Heat rash is another as it looks so red. :)
hope its sorted soon!