Thanks. I also thought it may be the brush as I reached for my Semogue 610 and face lathered...so today, I grabbed one of the softest brushes I own, Rooney ST2 and got similar irritation.
It seemed to not be instant reaction, but slowly grew and could feel a bit on pass three and then during the rinse it was visible.
I will try to test it out tonight once my face has settled down a bit.
I had reactions to both MdC and Mamma Bears. In both cases the first few shaves in a row would be fine, the 4th or 5th shave would give me a slight burning that felt similar t razor burn. The burning would build from there each shave. It got to the point I would have a reaction if I put it on my face at all.
It's a shame because both those soaps are good and now I don't have them anymore.
In unrelated news, I took a break from my Tabac frankensoap today and yesterday and tried out my Mike's Hungarian lavender. It was leaps and bounds better than the Tabac. I might toss the last 60 grams or so, not sure yet. Regardless, it's having a time out.