There are many possibities such as engorged lymph nodes (these are small nodes found throughout the whole body that filter away bacteria or anything bad from your body), lipomas, blood clots, ect. Go see a doctor and have him take a look. If they hurt then you might want to go see him sooner.... Without looking at them and based on what you have said I would think they are lipomas. These are benign(non-cancerous) fatty deposits that anyone can get. They are movable against the skin and shouldn't cause pain at all. These can be taken care of with minor surgery. They are usually found in the legs and arms and also the back. If you have any more questions please let me know and if this answer helps please hit the accept button for me.