Huge flair-up from after workout

Have had some mild eczema in the groin and the surrounding area. A little itchy but not a big problem. Then used a steroid (synalar) cream for 3 weeks, then I was supposed to have a 2 week break, and start 3 weeks again.

The cream worked well for 3 weeks, but 5 days out during the break I worked out on an exercise bike, and noticed soreness afterwards.

The following days, a severe outbreak of eczema came, much worse than before I started the treatment. Is tender and stings.

Call the specialist doctor's office and the secretary thought I should start with the next 3-week course.

Any experiences? It seems strange to have such a strong relapse. I have had very few issues with eczema as an adult.