As you may have noticed, above you will find words for "The normally sharp demarcation between the lip (red-coloured) and the adjacent normal skin, representing the change in the epidermis from highly keratinized external skin to less keratinized internal skin.". Hover the mouse over the word you'd like to know more about to view its definition. Click to find a better fitting word. Finally, thanks to ChatGPT, the overall results have been greatly improved.