Suggest Treatment For White Bumps On The Hand

So every time I shower or have my hands wet for a period of time, i get white slightly raised bumps on my hand. They re callous-like looking bumps, and they re very small; spreading across the palms of each hand and going up the gaps between my fingers. After a moment or two (or after they are dried), my hands still have the bumps, except they aren t as obvious. And I noticed that there are slight miniature holes in the bumps. I m not sure what it is at all! I ve had this problem for a few months now, and it doesn t drastically affect my everyday life. I m just curious as to what they are - help!