Gets worse as you age, as your skin gets thinner. The garlic and
tea tree, which you cited as bleach but bleach is chlorine, not
tea tree oil, well, they are for killing bacteria and fungus and are therefore drying, not moisturizing. You would use those to kill something you were infected with. Did your dermatologist give you a diagnosis? Because it sounds pretty normal to me, I've got cracks in all the fingers on my right hand from clearing things off the frozen ground in winter.