It seems that your partner might developed ecchymoses on both thighs inner areas. And that may be due to trauma or friction during sexual intercourse. It is not herpes
as you have doubt. The bruise
patches your partner is having need no treatment. That may go away by itself. Vitamin C
and K may be helpful to improve the condition. Thrombophob oint application may improve the bruise.
I hope you got my answer.
Dr. Ilyas Patel MD