Red marks on my big toes

[PCardus]

Hello

Over the last week, I've noticed red marks on the top of both my big toes between the nail and the main part of the foot.

There are small red dots as well. I thought at first that this could be a reaction to using a substance for clearing a blockage in my bath and then standing in the bath to have a shower the following morning, but I would have thought that any reaction would be on the soles of my feet.

Unfortunately, I don't see any way of posting photos that would be make things clearer.

The marks aren't painful, but they are a little bit itchy. The marks are worse on my left foot and the skin has become slightly harder there as well.

Does anyone know what this could be?

Thanks