Hello Valerie

Dandruff is a pretty common affliction.  But maybe you should look into this if it has moved to your legs.  Do you have eczema too? Is this something going on due to the dry air of winter do you think?

Here is information we have about dandruff and here is what is said about other causes:

"Dandruff tends to affect men more than women and also tends to be a more common problem for people with oily hair. In addition, it seems to affect those who suffer from high levels of stress or neurological illnesses such as Parkinson's disease.

Psoriasis and seborrheic dermatitis can both be mistaken for dandruff. Unlike dandruff, however, both of these issues can affect other areas of the body. If the condition is limited to your scalp, chances are your problem is dandruff. If you experience red, itchy, flaky patches on other areas of the body, see your dermatologist to rule out other conditions."

Here is a very good Medical News Today article about dandruff and causes and treatments.

I think you might want to see a dermatologist especially since this is on your legs too.  It may be something more than dandruff.

Thank you for your question.