Finger webs cracked for weeks, slowly spreading making micro blisters due to itching. triamcinolone acetonide helps but scared to use every day. what?

Go to see derm: You should go to see derm for evaluation. Although contact dermatitis and eczema could be the problem here however fungal infection is also possible and it would not be a good idea to use triamcinolone acetate ( which is a steroid) by itself in the setting of fungal infection without treating the infection as steroid can make fungal infection spread more. Go to see dermatologist to get checked.

Finger web cracks: Sounds like eczema. Usually there is something irritating the skin. See a dermatologist or an allergist.