Re: Shikko, toes, ouch!
Like Jeanne said; possibly a bunion. I have one bunion that is so bad that suwari waza is excruciating (bad knee too, but the bunion is the killer). Because of this, I alternate tachi and suwari waza (4 up, 4 down as turns go) so as not to short myself or my training partner on the suwari waza, but also not to make it much worse. Ask your sensei if you could do that because I have found it helps to not be down the whole time, but get the alternate standing/seated movements.