In response to your mention of painful cysts under the arms, I want to share an incident I had personally. Of course, I do not know what the cysts you have are like, but what I had (for several years) was like "lumps" under the arms and they were painful, more sometimes than others. I constantly worried it may be cancer. During a brief admission to a hospital, I showed it to a nurse and asked her if she had any idea what they were. I was astonished when she told me she had seen these before and she asked me what kind of deodorant I used. I answered "Arid XX Dry" and she said that was the problem. Although she did not know why this deodorant caused the problem, she said if I quit using it, the problem would go away. Well, within about a month after I quit using the deodorant, the problem was gone. I still can't get over such a simple remedy for such a worrisome problem.