I use extendabond mini tape tabs with lace and glue and there is no bump for me. If anyone ran their fingers down the back of my head they would feel absolutely nothing. I feel nothing myself. But going up the way they might feel the edge of the lace if they were really digging their fingers in. But people don't generally run their fingers up other people's heads and if it's an intimate encounter tell them you don't like it, sensitve skin etc.. They will not be upset!