Hi @beauty214, welcome to Connect.
I thought you might be interested in this information from Mayo Clinic about dermatitis that includes a video and helpful prevention hints.
Dermatitis https://www.mayoclinic.org/diseases-conditions/dermatitis-eczema/symptoms-causes/syc-20352380

I'd like to bring @gardeningjunkie and @stellgma into this conversation. They both have mentioned having Allergic Contact Dermatitis, and they may have similar experiences to share with you.

Beauty, You mention that you've had these marks for over 15 years. Do they still itch? Are you able to stop scratching?