There are several things that this could be. They could be warts, insect bites, eczema, psoriasis, or be caused by a virus (usually a type of herpes) or scabies. If they are troublesome, I would recommend going to a doctor.
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It means 'protecting hands'.
2 eyes on the road and 2 hands on the wheel
it means that the world is in your hands
Ambedexterous means: a person who is able to use both hands equally, instead of right or left handed. You can train yourself to use both hands equally.
To move "on all fours" would be to crawl on your hands on knees.