After reading your history it appears that your husband might have lichenification or purpura over the ankle. This can be due to trauma to local area which is causing damage to the skin day by day. I advise you to not pinch or pop the area. You can apply a mild steroid
cream such as Cortisone
cream. If itching is present then can take benadryl
accordingly. Consult a dermatologist
for checking the aggravating factor.