These brownish spots are a fungus. Dark, sweaty areas are most likely places for this problem. Everyone has fungus in their bodies. I am not sure if it is a worse problem, but I cannot get rid of mine. Dermatologist, Desitin, anti-fungal cream. I can't get rid of it. Maybe reduce sugar instake and keep the area dry and clean will help. It seems to help me. I have the exact same problem and I am pretty sure it has nothing to do with my age or being active... If you happen to get the right answer to this please let me know, I just posted almost the exact same question... Thanks
I am 17, almost 18. I have these light brown patches if you will, that do not hurt, or itch, or are raised. I just noticed them the day before. I am still a virgin, and I at first was freaked out by them. I do not know what this is...
Usually these come with age and it can strike from 40 up (even younger in some cases.) It depends on how active you are. It's the constant rubbing and it discolors the skin. Nothing to worry about. Some people can get it on the inner part of their arms (around from their elbows) and other parts of the body that never see daylight.
Some women going through hormonal changes can get these little patches on their faces that will either stay or sometimes fade out when their hormones level out.
im only 19 years old and i cant remember not having them, im very active too, i cant explain it.
[edit] I had these. Try going to the doctor, I got medicated anti-dandruff shampoo. (Selenium Sulfide) Worked very well. My skin cleared up after a week. Lather on patches, leave for 10 minutes, rinse. I think you can pick up shampoo like that from a chemist...The brand name is SELSUN. Good luck!