Allergies

Although there are numerous different types of skin complaint, only four are due to allergy:
eczema, also called atopic dermatitis;
allergic contact dermatitis;
urticaria; and
angioedema.

if foods such as cow’s milk and eggs were introduced into your diet too early;

However, doctors often see this pattern of eczema being followed by asthma and then hay fever. An infant with eczema has a 50% chance of developing another form of allergic disorder before the age of 10 years.

No one really understands why it is that eczema occurs most commonly in babies, why asthma can appear at any age but does so most commonly in childhood, nor why hay fever is uncommon before a child is 7 years old

the symptoms of allergy usually involve swelling, soreness, itchiness and increased secretions

There are some non-protein allergens, including penicillin and some other drugs.

If you are atopic, your immune system works perfectly well against these infectious organisms. However, it also has a tendency to over-react to substances that should be harmless, and to treat them as if they were attackers.

What these all have in common is that they contain protein

An allergen is any substance that acts as a trigger for allergy, provoking an allergic reaction in someone who is atopic

The common allergic diseases are asthma, hay fever, eczema and food allergy