The Devacurl No-Poo has menthol as an ingredient. Some people have reactions to it, so you may want to switch to a menthol-free no-poo (or their low-poo, which is also menthol-free) to see if that may be the culprit. A lot of folks had issues with Wen as well because of the menthol. I personally have had no problems but that could account for your red patches and irritation.