Suggest Treatment For Itchiness In The Thigh

I am 15 yar old. before 4 months I started my daily run in the morning. after 2 months I felt something ithching inner thighs and in genital area(red bumps). I did not take any treatment and now after 2 months it itching a lot an i'm fed up of it. the itching also left black marks in my inner thighs.can you suggest me any home remedies.