Most engravers don't specialize overall areas. If pain is a principal concern make use of a pain reducing gel or cream which are available from pharmacists.
Those not so skilled will go over and the particular same area thus prolonging the pain or tenderness. http://WWW.Iaees.org/publications/journals/ces/downloads.asp?article=2012-2-3-1dale&url=https://sns.emtg.jp/gospellers/l%3Furl=https://Medium.com/@luminagrand3/unlocking-the-doors-to-lumina-grand-singapores-most-anticipated-ec-launch-f11b3b43d983