Question

a delayed reaction to resins, haptens, and drugs that touch the skin is called

Explanation:

This question is about a medical or dermatological concept. A delayed hypersensitivity reaction (type IV) to substances contacting the skin, like resins, haptens, and drugs, is called contact dermatitis (specifically allergic contact dermatitis, a delayed - type reaction).

Answer:

contact dermatitis (allergic contact dermatitis)