[Skin Concerns] - A brown spot appeared on my forearm overnight

Beauty Tips For Body Care
Hello,I am a little bit worried because this morning I noticed that a brown spot had appeared on my arm overnight. I doesn't hurt or anything so I know that I didn't scratched myself while asleep. Can anyone tell my what this could be?Thanks a lot in advance.Pic: http://i.imgur.com/fr6aB6M.jpg
Girls Blog 2015
Submitted by limpachamines