On exposure to the allergen, an Immunologic (IgE) or a non-immunologic reaction
is set in process,
which ultimately releases histamine,
which acts at the peripheral receptors, resulting in allergic reactions and rashes.
The aim of the therapy is identification and removal of trigger factor. It is the most important and the only effective long-term therapy. Since you are already aware of the triggering factors, avoid them or desensitize yourself with the help of an allergy specialist.