Preformed Steps Blistering

#1
We have a 33,000 gallon, club shaped, vinyl lined, in ground pool. The shallow end is about 3ft deep and has a set of preformed steps. I’m assuming the steps are made with fiberglass and have gel coat similar to a boat hull.

I just noticed 5 or 6 nickel sized blisters in the gel coat. They are raised areas that show some small cracks but I don’t believe the pool is loosing any water. All of them are below the waterline and feel firm to the touch.

What, if anything, should I do about this?