I have them a lot!!!!! They, supposedly, are very localized muscle spasms!!! I sat there one day and my leg was moving and shaking for over an hour. I have had them on my face, legs, arms, hands, and even on one of my breasts!
I have heard they can be caused by the lupus, fibromyaligia and/or possibly your meds!!!!
I would, as usual, mention it to your doctor and see what he/she has to say...They can probably check a few things on a lab panel...I know I am a consistent hypokylemic (sp?) and that can cause or exacerbate the issue.
I hope this helps! Hugs to all,
ladybrannon