I had asked for some additional information and have not heard back.
In someone with recent onset of a rash that appears like a contact dermatitis, it is common to simply treat the rash with topical or oral steroids. If the rash resolves, then no further care is needed. Contact dermatitis can occur as a type of allergy or due to exposure to an irritant
If a contact dermatitis recurs once the steroid course is completed, then there are a couple options. First, it would be good if the substance to which the persons is reacting can be identified, so that the substance can be avoided. It is frequently not easy to identify the substance, and it typically requires noting what contact has occurred that makes the rash worse. One of my patients would have recurrent rashes that were ultimately found to be due to a particular upholstered chair at his house. It was not the chair that he sat in most days, but he was able to identify that the rash got worse after sitting in that chair.
If the cause cannot be identified and avoided, then it may require long term treatment with steroids or other medicines to suppress the immune response. We would prefer to avoid long-term treatment with oral steroids, so would prefer topical steroids, although it may require a sstronger steroid cream than can be obtained over the counter. There also are some topical medicines that suppress the immune system via a different mechanism that can be considered, such as tacrolimus or pimecrolimus.
If I can provide any further information, please let me know.