Here is hat i found...Some skin disorders like riehl's melanosis, linea fusca, erythromelanosis follicularis or poikiloderma of civatte can lead to black spots on skin. Antibiotics like tetracyclines, amiodarone, phenytoin are also known to cause black spots on skin. Apart from these conditions, suntan or sunburn can also cause formation of black spots on skin. Other health conditions like liver disease, hemochromatosis can also lead to this problem.
to treat it i found a site here:http://www.buzzle.com/articles/black-spots-on-skin.html
HI Have u had a recent health check at the doctors? Are they raised at all? You need to go to the doctors and get this checked as there are treatments that can get rid of these lesions! All the best Trish
Hi, you could be suffering from a condition called Raynaud's.
http://en.wikipedia.org/wiki/Raynaud's_phenomenon,
Have a look at this website I hope it may be helpful for you.