Reaction to Aztec clay mask???

Hi guys, I recently decided to use the Aztec healing clay mask! I first tried it on my face and I was wowed by the results so I went ahead and tried it on my back... I mixed it with water and I left it on for the amount of minutes on the container. After about a day or two, my the skin on my back got really bumpy and itchy, I hate how it feels. I also developed a sort of rash on other parts of my body (I did use the mask there too) and now I suddenly get this tingling sensation that’s kinda painful. I did see my doctor and she did prescribe medication, my skin is getting better, however the tingling sensation hasn’t gone away?

Has anyone had any similar experience to using the clay mask? Or in general?