aunty
Your identification of a certain duration of time as the major point of your eczema irritation does help to narrow the field of perspective allergen/irritant culprits. Based upon your general statement, and without going into detail regarding other things that would factor into that time period, two major culprits that immediately standout would be a food allergen or bed mites.
To pinpoint a more exact cause, some other questions need to be asked and answered. To investigate the food allergen theory further, you would need to determine if your eczema flared after every dinner meal, or just on certain occasions. Considering that an individual usually eats a different meal from one day to the next, a flareup after every dinner meal could either indicate that you have multiple food allergens that you aren't aware of; or, that your beverage of choice for dinner (which is probably the most consistent item from day to day) is culprit.
However, a flareup after every dinner meal and into bedtime may have nothing to do with a food allergen and more to do with other eczema culprits that present themselves in the evenings when you're at home. That other culprit could be bed mites. If you shower before bedtime, still another culprit could be chlorine or fluoride in a treated water system. Along with that could be a drying soap or cleanser used to clean the skin.
Location of your eczema flareups are very telling as well. This helps to determine the culprit. For example, isolation to the hands could indicate a contact dermatitis; whereas total body itching/inflamation could indicate an airborne irritant (like pet dander/dust mites) or food allergen. Reoccurring flareups in weak spots could indicate candida. These are just a few examples of how the body gives hints in determining the eczema culprit.
Regarding the odor after incorporating the liver cleanse, your hypothesis regarding the odor manifesting as a result of toxic waste being released is a good guess considering that the liver is classified as the body's toxic waste dump. This may be an indicator to you that the liver cleanse is actually working.
In summary, to narrow the field of perspective allergen/irritant culprits even further, you need to ask and answer more questions regarding the specific activities that take place from dinner to bedtime.
aunty