HI Well come to HCM These could be nonspecific swellings, if this is not paining or have changed within this period then this is nothing to worry, because of the friction this might have developed circle for this you can try Diphenhydramine lotion for local application, possibility of lipoma need to be ruled out, let me tell you as long as the skin lesions are concern, clinical examination is must, because this is the way of diagnosis, this kind of art of looking at the lesion, hope this information helps, take care.