Conclusion
Hives and eczema are different skin conditions that require different treatments. Eczema is predominant among children but can also affect adults in rare cases. You might not know the difference between both conditions, so you must speak to your doctor about your condition. Try not to use drugs like antihistamines or any antibiotics to treat any of the conditions without a prescription.
References;
[1] https://en.m.wikipedia.org/wiki/Corticosteroid
[2] https://en.m.wikipedia.org/wiki/Acupuncture
[3] https://www.verywellhealth.com/blanching-skin-5114565#:~:text=Blanching%20of%20the%20skin%20is,is%20considered%20a%20physiologic%20test.
[4] https://en.m.wikipedia.org/wiki/Anaphylaxis
[5] https://www.mayoclinic.org/diseases-conditions/low-blood-pressure/symptoms-causes/syc-20355465
[6] https://www.mayoclinic.org/diseases-conditions/urinary-tract-infection/symptoms-causes/syc-20353447
[7] https://medlineplus.gov/ency/article/000435.htm
[8] https://my.clevelandclinic.org/health/drugs/21223-antihistamines