the skin : Degrees of Seriousness
Although irritation and allergy are often found in association they are clearly different phenomena. Irritation is in principle reversible, while allergy (which calls on immunological memory) is irreversible. Developing work-related contact dermatitis often means changing professions.
That being the case, the development of an allergy must be avoided at all costs through appropriate care and protection. The first spots of irritations are alarm signals and immediate response is imperative (see pp. 19-23).