Hello Elise,
After searching on Google, I read your post which and have just registered to this site to be able to ask you a question. I hope that you’ll take pity on me and will post a reply.
I’m a 37 year old female and am in great shape. Two days ago I starting having the exact same type of sensation in my leg that you described, i.e. it feels like a heating pad has been applied to my lower right leg, above the ankle but not on the shin bone, and it last about 10 seconds and has been happening about 5-6 times per hour. I’m scared about it and would like to know what you’ve learned about this and whether it’s gone away. Did you seek a physician’s advice? What type of doctor?
I would truly appeciate hearing more about your story. Thank you, very much, in advance. With kind regards, Marguerite