Is There Any Way To Get Rid Of Dry Raised Brown Spots On My Inner Thighs And Behind My Knees?

I m 70 years old and I notice dry spots that turn into raised brown spots on my inner thigh around the back of my knees,anywhere where my clothing rubs.they don,t itich or get red and I haven,t been sexually active in four years.Isthere some way to get rid of these or prevent them