Any advice on what this problem can be?

My mom has been getting this rash. It started on her hands very scaly and itchy then turned red. The rash eventually continued all over her body. It looks like little red dots some are individual and some are clustered together. A couple of them are starting to burst and bleed. She went to a dermatologist and they said it was seborrheic keratosis but, the symptoms and images are just not matching up with her problem. They are making her go for shots every week and her take antibiotics to help but, i don't want her doing that when she don't need it or it might not even be the problem.She is going for a second opinion soon. Any advice on what it can be ? Please help