Don't want to lay into you at all Jane. If you search my posts you will see that I am just about as far from a bully as it's possible to get!
Mumsnet has been targetted by some real sickos, posting about issues to do with children and urine / poo / nappies etc, for kicks. A quick look at the OP's other posts revealed that most, though not all, of her posts were to do with the same subjects. Added to this were her profile photos, nothing wrong with them as such, but one of her young child, back to the camera, unclothed with bottom showing, did concern me. Everyone should be aware of the potential for photos of children like this to be misused by very unpleasant people, if they post them on the internet.
I totally take the OPs explanation that these photos were connected with an unexplained rash (which was visible on the photo) however I did feel that she needed to be warned about the impression that other people may have got of her - as I did - that she might not be as she seemed, iyswim.
OP did recieve some good advice. OP is hopefully now more aware that publishing nude pics of your children on the internet is not a very good idea, for any number of reasons.
And just as background, a few years ago I discovered that the man who had been 'best man' at my wedding was in fact a paedophile, with an interest in very violent child pornography from the net. Let's just say I try to be more cautious and aware since that experience.
I wish the OP every luck with getting the help that she needs.