Go to the doctor.
It could be mites or fungi.
The skirts were low cut, just about at the knees. Before, they were at the ankles.
Think before you speak.
(stretch well before attempting) take your ankles into your hands, *wrap wrists around inside of ankles) and bring up to forehead. It should seem easy and obvious but is particularly painful if you are not flexible.
It is good to be very flexible before starting en pointe, but starting has to do mostly with strength, mostly in the ankles. Keep working on flexibility, especially in your ankles and legs, to help you with dance in the future.
No. The itching is the by product of the lice. You need to go to the drug store and by a shampoo just for killing lice. You will have to use it several times before you get them all.
Put icy hot or itching powder in a baby's diaper.
I would visit your doctor before looking for medications to help your sore, swollen ankles. A non-medication treatment would be compression stockings, which are available in low pressure stockings or socks at most pharmacies.
"Spats" were laced around the ankles of soldiers from before WWI until the early years of WWII.
If you have tender skin, it will be a day or two before the itching will stop.
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It depends on what type of dancing. Some dancers can sprain ankles or pull something but, if you are careful, its pretty safe to dance. Always stretch out before you do!