Whether the birthmark needs medical care or not cannot be determined without seeing it. The birthmark might be a nevus. The dimensions might have been helpful. It is also important whether the surface is rough or not.


Signs of a nevus malignancy include: quick spreading, bleeding that does not heal, itching, and parts falling. It is possible that the crack you mentioned might be a sign of malignancy, but in your case, the location might be causing it. Therefore, it is highly recommended that you see a dermatologist. Meanwhile, protecting the birthmark from further mechanical injuries by wearing shoes is imperative.