I'm so sorry to hear about your husband's suffering. I know it is difficult for him, and also difficult for you to watch this journey he is taking right now.
As Merry said, I'm wondering if you have asked the hospice nurse about these bumps? I found that hospice is very good at an understanding regarding the late stages of the disease and they might be able to explain it to you.
We also have a Caregiver's Group. Here is a link to that discussion group, https://connect.mayoclinic.org/group/caregivers/. You will find many members of this group who are dealing with the same experiences and emotions that you are having now.
Do you have a support system in place for you and your husband? I'm thinking about family, friends, church, etc.?