My husband had 2 hard white raised lumps on his scalp.he is bald ,felt very dry . They have since fallen off and open sores that bleed are left , they then start to heal and the same will happen again , no matter how careful he is when drying himself . He started with 2 now has 4 .any suggestions , I am concerned it might be skin cancer as he has lost the top part of an ear to skin cancer