Iodine Burns ?

[Chestnutter]

Okay,
my horse has very very sensitive feet, he's a typical TB and goes lame on the slightest little thing.
so last monday i went to bring him in and he had lost a shoe, but was hopping lame and could barely walk.
i left him out and went to ask opinion of yard manager who told me to bring him in so she could have a look.
he suffers from thrush which is treated with iodine everytime he comes in, but i'm very careful to only get it on the frog and nowhere near his heels.

however, when the yard manager had a look, she put iodine on his feet again but put so much and held his foot up so that it could soak in, but because she had put so much on, it all ran down his legs.

The next day, his legs had pussy scabs and later turned into all over scabs which are thankfully now healing nicely.
It may be a silly question but is it an iodine burn or just a reaction to something?
his legs are white, and i wondered if it may have been sunburn - coincidence?

 

[Gucci_b]

Iodine can cause a lasting stinging sensation called iodine burn. Burning is especially likely if the wound is covered with a bandage before the iodine has had time to dry. It is also more likely with iodine solutions that contain 7% iodine or more. Iodine solutions this strong should not be used as antiseptics.
Antiseptics are medicines that slow or stop the growth of germs and help prevent infections in minor cuts, scrapes, and burns.
Purpose
Antiseptics are applied to the skin to keep bacteria from getting into wounds and causing infection. Although antiseptics do not usually kill bacteria, they do weaken them and slow their growth.
Simply applying an antiseptic to a wound is not adequate treatment. The wound should be cleaned first, and in most cases it should be covered with a bandage or other type of dressing to keep it clean and moist while it heals. However, some antiseptics, such as phenol, can damage the skin if the wound is covered after they are applied. Others, such as hydrogen peroxide and iodine, should be allowed to dry completely before the wound is covered.
Because antiseptics can irritate the skin and even interfere with the healing process, they should be used sparingly. Some medical experts advise people to use antibiotic ointments instead of antiseptics because they can actually kill the bacteria that may cause a wound to become infected. Rule of thumb: if hydrogen peroxide or another antiseptic is the only thing available to use at the time of injury, use it. If an antibiotic ointment or cream is available, use one of them instead.
Description
Some commonly used antiseptics are isopropyl alcohol, hydrogen peroxide, iodine, phenol, methyl salicylate, and thymol. Most of the antiseptic products on the market contain one or more of these ingredients. Recommended dosage
The correct amount to use depends on the product.
Precautions
General precautions
Antiseptics are meant to be used for no more than one week. If the wound has not healed in that time, stop using the antiseptic
Only minor cuts, scrapes, and burns should be treated with antiseptics. Certain kinds of injuries may need medical care and should not be self-treated with antiseptics.