Small white patches of depigmentation, which is usually about 1 to 2 mm in size, commonly seen on the legs, can also be seen on the arms and as well as on the stomach area. These are called as idiopathic acute hypomelanosis which is normal hypopigmentation or normal depigmentation which you do not have to be worried about. There are little areas of depigmentation which is very very tiny and can be multiple in number. You might observe quite a few of these patches especially increasing with advancing age. They are like gray hairs which increase with age. Usually no treatment is needed for these spots but however, if you see that they are increasing in size and are merging into each other, it is time to see a dermatologist for proper diagnosis. Even for the skin condition Vitiligo, treatment is available. This is just a case of skin depigmentation/decolorization and there is nothing to get worried about. If the white spots/patches are just 2 to 3 mm in size, you don’t have to worry about the same.
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The information provided in Dr. Dixit's answer is for educational purposes only and is not intended to constitute medical advice. The information provided should not be relied upon as a substitute for consultations with a qualified health professional who may be familiar with your individual medical needs.